EP1524123A1 - Printer, printing method, program, computer system - Google Patents
Printer, printing method, program, computer system Download PDFInfo
- Publication number
- EP1524123A1 EP1524123A1 EP03741146A EP03741146A EP1524123A1 EP 1524123 A1 EP1524123 A1 EP 1524123A1 EP 03741146 A EP03741146 A EP 03741146A EP 03741146 A EP03741146 A EP 03741146A EP 1524123 A1 EP1524123 A1 EP 1524123A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printed
- medium
- detection means
- causing
- detection position
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0095—Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end
Definitions
- the present invention relates to printing apparatuses, printing methods, programs, and computer systems.
- the present invention relates to a printing apparatus provided with detection means that is capable of moving and that is for detecting a medium to be printed, and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means, a printing method for such a printing apparatus, a program for controlling such a printing apparatus, and a computer system provided with such a printing apparatus.
- Inkjet printers that print by intermittently ejecting ink are known as printing apparatuses for printing images onto various types of media to be printed, such as paper, cloth, and film.
- printing is carried out by repeating in alternation a process of positioning a medium to be printed by carrying it in a direction toward a print head, and a process of ejecting ink while moving the print head in a main-scanning direction that intersects the carrying direction in which the medium to be printed is carried.
- the medium to be printed When carrying the medium to be printed in the direction toward the print head, if the medium is carried with either its upper right end or its upper left end leading the other, that is, if the medium to be printed is skewed in the carrying direction, then the actual print position on the medium to be printed deviates from the anticipated print position, and this affects the quality of the image. In particular, in the case of performing borderless printing, if a blank area is formed at the upper edge of the medium to be printed due to the medium to be printed being skewed in the carrying direction, there is a possibility that the medium to be printed may be rendered useless.
- the present invention was arrived at in light of the foregoing issues, and it is an object thereof to achieve a printing apparatus, a printing method, a program, and a computer system with which the print start position of a medium to be printed can be determined very precisely and efficiently.
- a primary aspect of the present invention is a printing apparatus comprising: detection means that is capable of moving and that is for detecting a medium to be printed; and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means; the printing apparatus causing the detection means to be positioned on one side in the movement direction; causing the carrying means to carry the medium to be printed in a predetermined direction up to a detection position where the detection means detects the medium to be printed; and when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side opposite from a side where the detection means is positioned is leading by at least a set amount at the detection position, causing the detection means to be positioned on the other side that is opposite from the one side in the movement direction, then causing the carrying means to carry the medium to be printed from the detection position in a direction opposite from the predetermined direction, then causing the medium to be printed to be carried in the predetermined direction up to the detection position where the detection means detects the medium
- a printing apparatus comprises:
- the detection means is positioned on the other side from the one side, the medium to be printed is carried from the detection position in a direction opposite from the predetermined direction, the medium to be printed is carried in the predetermined direction up to a detection position where the detection means detects the medium to be printed, and then the medium to be printed is carried by a predetermined amount in the predetermined direction from the detection position.
- the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently. That is, the formation of blank areas at the upper edge of the medium to be printed and an increase in ink consumption when borderless printing is performed are eliminated.
- the medium to be printed when an upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side where the detection means is positioned is leading at the detection position, the medium to be printed may be carried by the carrying means in the predetermined direction from the detection position by the predetermined amount.
- the medium to be printed when the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side opposite from the side where the detection means is positioned is leading by less than the set amount at the detection position, the medium to be printed may be carried by the carrying means in the predetermined direction from the detection position by the predetermined amount.
- the medium to be printed is carried as it is from the detection position in the predetermined direction by the predetermined amount in a case where the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side opposite from the side where the detection means is positioned is leading the other only by an amount that is less than the set amount at the detection position.
- the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently.
- this printing apparatus may be provided with a print head for printing on the medium to be printed by ejecting ink as the print head moves in a main-scanning direction that intersects the carrying direction in which the medium to be printed is carried.
- the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently in cases where there is a print head that can move in a main-scanning direction that intersects the carrying direction in which the medium to be printed is carried.
- the detection means may be provided together with the print head in/on a moving member for moving in the main-scanning direction.
- the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently using the detection means that is provided together with the print head in/on the moving member.
- the upper end, among the upper right end and the upper left end of the medium to be printed, that is leading at the detection position may be found by detecting whether or not the medium to be printed is present by moving the detection means from the one side to the other side in the movement direction after carrying the medium to be printed in the predetermined direction up to the detection position where the detection means positioned on the one side in the movement direction detects the medium to be printed.
- the foregoing printing apparatus it is possible to determine the print start position, in a predetermined direction, of the medium to be printed very accurately and efficiently using the detection means for detecting whether or not the medium to be printed is present by moving from one side to the other side in a movement direction after the medium to be printed is carried in the predetermined direction up to the detection position where the detection means positioned on the one side in the movement direction detects the medium to be printed.
- the detection means may be made difficult for the detection means to detect the medium to be printed when the detection means is moved from the one side to the other side in the movement direction.
- the medium to be printed is kept from being carried in the direction opposite from the predetermined direction if the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side opposite from the side where the detection means is positioned is leading by less than a set amount.
- the detection means in the process of moving the detection means from the one side to the other side in the movement direction, if the detection means does not detect the medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the one side in the movement direction of the detection means is leading at the detection position, or that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the other side in the movement direction of the detection means is leading by less than the set amount; and if the detection means detects the medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the other side in the movement direction of the detection means is leading by at least the set amount.
- the detection means when the detection means does not detect the medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the one side in the movement direction of the detection means is leading at the detection position, or that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the other side in the movement direction of the detection means is leading only by an amount that is less than the set amount.
- the medium to be printed is kept from being carried in the direction opposite from the predetermined direction, allowing the print start position, in the predetermined direction, of the medium to be printed to be determined more efficiently.
- the detection means may have a light-emitting member for emitting light and a light-receiving member for receiving the light that is emitted by the light-emitting member, and may detect the medium to be printed based on an output value of the light-receiving member.
- the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently using the detection means, which includes a light-emitting member and a light-receiving member.
- the print head may perform printing with respect to an entire surface of the medium to be printed.
- the foregoing printing apparatus it is possible to determine the print start position, in the predetermined direction, of the medium to be printed very accurately and efficiently in cases where printing is carried out with respect to the entire surface of the medium to be printed.
- a printing apparatus comprising: detection means that is capable of moving and that is for detecting a medium to be printed; and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means; the printing apparatus causing the detection means to be positioned on one side in the movement direction; causing the carrying means to carry the medium to be printed in a predetermined direction up to a detection position where the detection means detects the medium to be printed; when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side where the detection means is positioned is leading at the detection position, causing the medium to be printed to be carried by the carrying means in the predetermined direction from the detection position by a predetermined amount; when an upper end, among the upper right end and the upper left end of the medium to be printed, that is on a side opposite from the side where the detection means is positioned is leading by at least a set amount at the detection position, causing the detection means to be positioned on the other side that is
- a printing method for a printing apparatus provided with a sensor that is capable of moving and that is for detecting a medium to be printed, and a carry roller for carrying the medium to be printed in a direction that intersects a movement direction of the sensor, comprises:
- the foregoing printing method allows the print start position, in the predetermined direction, of the medium to be printed to be determined very accurately and efficiently.
- a program causes a printing apparatus provided with detection means that is capable of moving and that is for detecting a medium to be printed, and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means, to achieve:
- the foregoing program allows controlling to be executed such that the print start position, in the predetermined direction, of the medium to be printed is determined very accurately and efficiently.
- Fig. 1 is a block diagram showing an example configuration of a computer system of the present invention.
- a color inkjet printer 20 serves as the printing apparatus, and a computer system is constituted by the color inkjet printer 20, a computer 90, a display device (such as a CRT 21 or a LCD that is not shown), input devices (such as a keyboard and a mouse that are not shown), and a drive device (such as a flexible drive device or a CD-ROM drive device that are not shown).
- a display device such as a CRT 21 or a LCD that is not shown
- input devices such as a keyboard and a mouse that are not shown
- a drive device such as a flexible drive device or a CD-ROM drive device that are not shown.
- the computer 90 has a video driver 91 for driving display of the CRT 21, a printer driver 96 for driving printing of the color inkjet printer 20, and an application program 95 for controlling driving of the video driver 91 and the printer driver 96.
- the video driver 91 suitably processes image data to be processed and supplies them to the CRT 21.
- the CRT 21 displays an image corresponding to the image data supplied from the video driver 91.
- the printer driver 96 suitably processes image data to be processed and supplies them to the color inkjet printer 20 as print data PD.
- the printer driver 96 is provided with a resolution conversion module 97, a color conversion module 98, a halftone module 99, a rasterizer 100, a user interface display module 101, a UI printer interface module 102, and a color conversion lookup table LUT.
- the resolution conversion module 97 converts the resolution of the color image data formed based on the application program 95 into a resolution for printing. It should be noted that the color image data after conversion by the color conversion module 97 are made of the three color components RGB. Therefore, the color conversion module 98 references the color conversion lookup table LUT and converts, pixel by pixel, the RGB color image data having been output from the resolution conversion module 97 into multi-gradation data of a plurality of ink colors that can be used by the color inkjet printer 20. It should be noted that the multi-gradation data after conversion by the color conversion module 98 have a gradation value of 256 grades, for example.
- the halftone module 99 executes halftone processing with respect to the multi-gradation data that are output from the color conversion module 98 to create halftone image data.
- the rasterizer 100 arranges the halftone image data having been output from the halftone module 99 into a data order for supplying to the color inkjet printer 20, and supplies them to the color inkjet printer 20 as the print data PD mentioned above.
- the print data PD include raster data indicating how dots are to be formed when the print head moves in the main-scanning direction, and data indicating the carry amount by which to successively move the medium to be printed in the sub-scanning direction, which intersects the main-scanning direction.
- the user interface display module 101 has a function for displaying various windows related to printing and a function for receiving instructions input from the user through these windows.
- the UI printer interface module 102 is positioned between the user interface display module 101 and the color inkjet printer 20, and serves as a two-way interface between them. That is, when a user gives an instruction to the user interface display module 101, the UI printer interface module 102 serves as an interface by decoding commands from the user interface display module 101 and sending the various commands COM that are obtained to the color inkjet printer 20. Conversely, the UI printer interface module 102 also serves as an interface in the other direction by supplying various commands COM from the color inkjet printer 20 to the user interface display module 101.
- the printer driver 96 achieves a function for supplying print data PD to the color inkjet printer 20 and a function for sending and receiving various types of commands COM to and from the color inkjet printer 20.
- a program for achieving the functions of the printer driver 96 is supplied to the computer 90 in a format in which it is stored on any one of various computer-readable storage media, including flexible disks, CD-ROMs, magneto optical disks, IC cards, ROM cartridges, punch cards, printed materials on which a code such as a bar code is printed, and internal storage devices and external storage devices of a computer.
- the program for achieving the functions of the printer driver 96 can also be downloaded onto the computer 90 from, for example, a publicly available WWW (World Wide Web) server on the Internet.
- WWW World Wide Web
- Fig. 2 is a schematic perspective view showing an example of the primary structures of the color inkjet printer 20 shown in Fig. 1.
- the color inkjet printer 20 is provided with a paper stacker 22, a paper feed roller 24 driven by a step motor that is not shown, a platen 26, a carriage 28 serving as a moving member, a carriage motor 30, a pull belt 32 that transmits the drive force of the carriage motor 30, and guide rails 34 for guiding the carriage 28.
- the carriage 28 is provided with a print head 36 that has numerous nozzles for forming dots, and a reflective optical sensor 29 serving as a light-emitting member and a light-receiving member that will be described in detail later.
- the carriage 28 is pulled by the pull belt 32, to which the drive force of the carriage motor 30 is transmitted, and moves in the main-scanning direction as shown in Fig. 2 along the guide rails 34.
- the print paper P is drawn from the paper stacker 22 and then rolled by the paper feed roller (also referred to as the "carry roller") 24, which is an example of the carrying means, and carried in the sub-scanning direction, which is perpendicular to the main-scanning direction shown in Fig. 2, over the surface of the platen 26.
- the paper feed roller 24 is driven when the operation for supplying the print paper P from the paper stacker 22 onto the platen 26 and the operation for discharging the print paper P from the platen 26 are performed.
- Fig. 3 is a schematic diagram for describing an example of the reflective optical sensor 29 provided in the carriage 28.
- the reflective optical sensor 29 has a light-emitting member 38 such as a light-emitting diode that emits light, and a light-receiving member 40 such as a phototransistor for receiving the light that is emitted by the light-emitting member.
- the light-emitting member 38 is not limited to the light-emitting diode mentioned above, and any member may be adopted as the light-emitting member 38 as long as the member can constitute an element for achieving the present invention by emitting light.
- the light-receiving member 40 is not limited to the phototransistor mentioned above, and any member may be adopted as the light-receiving member 40 as long as the member can constitute an element for achieving the present invention by receiving the light from the light-emitting member 38.
- the incident light that is emitted by the light-emitting member 38 has directionality, and if there is print paper P in the direction of incidence, then it is irradiated onto the print paper P, whereas if there is no print paper P in the direction of incidence, then it is irradiated onto the platen 26.
- the incident light that is irradiated onto the print paper P or the platen 26 is reflected, and the light that is reflected at this time is received by the light-receiving member 40 and converted into an electric signal as an output value corresponding to the intensity of the reflected light.
- the intensity of light reflected by the print paper P and the platen 26 is different, it is possible to determine whether or not the print paper P is in the direction of incidence of the reflective optical sensor 29 based on the intensity of the electric signal that is obtained from the light-receiving member 40.
- the intensity of the electric signal that is obtained from the light-receiving member 40 is measured by an electric signal measuring section 66, which is described later.
- the reflective optical sensor 29 is a single unit constituted by the light-emitting member 38 and the light-receiving member 40, but this is not a limitation. That is, it is also possible to adopt a configuration in which the light-emitting member 38 and the light-receiving member are separate members making up the reflective optical sensor 29, and this reflective optical sensor 29 is provided in/on the carriage 28.
- the electric signal corresponding to the intensity of the reflected light obtained from the light-receiving member 40 is measured in this embodiment, but this is not a limitation. That is, it is also possible to provide a means capable of measuring the intensity of the reflected light received by the light-receiving member 40 in a form other than an electric signal.
- Fig. 4 is a diagram showing an example of a configuration of the periphery of the carriage 28 in the color inkjet printer 20.
- the color inkjet printer 20 is provided with a paper feed motor (hereinafter referred to as "PF motor”) 31 for carrying the print paper P, the carriage 28 in which the print head 36 for ejecting ink onto the print paper P is provided and which moves in the main-scanning direction, the carriage motor (hereinafter referred to as "CR motor”) 30 for driving the carriage 28, a linear encoder 11 provided in the carriage 28, a linear scale 12 in which slits are formed at a predetermined spacing, the platen 26 for supporting the print paper P, the paper feed roller 24 to which the drive force of the PF motor 31 is transferred and which is for carrying the print paper P in the sub-scanning direction, a rotary encoder 13 for detecting the amount of rotation of the paper feed roller 24 (see Fig. 7), a pulley 25 provided about the rotational shaft of the CR motor 30, and the pull belt
- Fig. 5 is an explanatory diagram of the linear encoder 11.
- the linear encoder 11 is for detecting the position of the carriage 28, and has a linear scale 12 and a detecting section 14.
- the detecting section 14 is provided in opposition to the linear scale 12 and on the carriage 28 side.
- the detecting section 14 has a light-emitting diode 11a, a collimating lens 11b, and a detection processing section 11c.
- the detection processing section 11c has a plurality (for example, four) photodiodes 11d, a signal processing circuit 11e, and two comparators 11fA and 11fB.
- the light-emitting diode 11a emits light when a voltage Vcc is applied to it via resistors on the anode side. This light is incident on the collimating lens 11b.
- the collimating lens 11b turns the light emitted from the light-emitting diode 11a into parallel light, and irradiates the parallel light onto the linear scale 12.
- the parallel light that passes through the slits provided in the linear scale 12 passes through stationary slits that are not shown and is incident on the photodiodes 11d.
- the photodiodes 11d convert the incident light into electric signals.
- the electric signals that are output from the photodiodes 11d are compared in the comparators 11fA and 11fB and the results of these comparisons are output as pulses. Then, the pulse ENC-A and the pulse ENC-B that are output from the comparators 11fA and 11fB become the output of the linear encoder 11.
- Fig. 6 is a timing chart showing the waveforms of the two types of output signals of the linear encoder 11.
- Fig. 6(a) is a timing chart of the waveform of the output signal when the CR motor 30 is rotating forward.
- Fig. 6(b) is a timing chart showing the waveform of the output signal when the CR motor 30 is rotating in reverse.
- the phases of the pulse ENC-A and the pulse ENC-B are misaligned by 90 degrees both when the CR motor 30 is rotating forward and when it is rotating in reverse.
- the phase of the pulse ENC-A leads the phase of the pulse ENC-B by 90 degrees.
- the phase of the pulse ENC-A is delayed by 90 degrees with respect to the phase of the pulse ENC-B.
- the position of the carriage 28 is detected as follows. First, the rising edges or the falling edges of the pulse ENC-A or ENC-B are detected, and the number of detected edges is counted. The position of the carriage 28 is calculated based on the counted number. With respect to the counted number, when the CR motor 30 is rotating forward, a "+1" is added for each detected edge, and when the CR motor 30 is rotating in reverse, a "-1" is added for each detected edge.
- the period of the pulses ENC is equal to the slit spacing of the linear scale 12, and thus, if the counted number is multiplied by the slit spacing, then the amount of movement from the position of the carriage 28 when to the count number is "0" can be obtained.
- the resolution of the linear encoder 11 in this case is the slit spacing of the linear scale 12. It is also possible to use both the pulse ENC-A and the pulse ENC-B to detect the position of the carriage 30.
- the periods of the pulses ENC-A and ENC-B are equal to the slit spacing of the linear scale 12, and the phases of the pulse ENC-A and the pulse ENC-B differ by 90 degrees, so that by detecting the rising edges and the fallings edges of each pulse and counting the number of detected edges, a count number of "1" corresponds to 1/4 of the slit spacing of the linear scale 12.
- the resolution of the linear encoder 11 in this case is 1/4 the slit spacing of the linear scale 12.
- the rotary encoder 13 has substantially the same configuration as the linear encoder 11, except that a not-shown rotation disk that rotates in conjunction with rotation of the paper feed roller 24 is used in place of the linear scale 12 provided on the color inkjet printer 20 side.
- Fig. 7 is a block diagram showing an example of the electrical configuration of the color inkjet printer 20.
- a buffer memory 50 is for temporarily storing the signals supplied from the computer 90.
- An image buffer 52 is where the print data PD, of among the signals stored in the buffer memory 50, are supplied.
- a system controller 54 is where the various commands COM, of among the signals stored in the buffer memory 50, for controlling the operation of the color inkjet printer 20 are supplied.
- the main memory 56 stores, in beforehand, program data for controlling the operation of the color inkjet printer 20 without regard to the interface between the computer 90 and the buffer memory 50, and a data table that can be referenced when controlling the operation of the color inkjet printer 20, for example, and is connected to the system controller 54.
- a nonvolatile memory such as a mask ROM to which data are burned and fixed during manufacturing, an EPROM whose data can be erased with ultraviolet light, and an EEPROM with which data can be rewritten electrically
- a volatile memory such as an SRAM that can hold data with the backup power source
- the EEPROM 58 stores rewritten information, such as the remaining ink amount, that changes each time the printing operation is performed, and is connected to the system controller 54.
- the system controller 54 is connected to a RAM 57 for storing working data, a main-scan drive circuit 61 for driving the CR motor 30, a sub-scan drive circuit 62 for driving the PF motor 31, a head drive circuit 63 for driving the print head 36, a reflective optical sensor control circuit 65 for controlling the light-emitting member 38 and the light-receiving member 40 making up the reflective optical sensor 29, the linear encoder 11, and the rotary encoder 13.
- the reflective optical sensor control circuit 65 has an electric signal measuring section 66 for measuring the electric signals corresponding to the intensity of the reflected light obtained from the light-receiving member 40.
- the system controller 54 decodes the various commands COM supplied from the buffer memory 50, and suitably supplies the command signals obtained as the result of this decoding to the main-scan drive circuit 61, the sub-scan drive circuit 62, and the head drive circuit 63, for example.
- the head drive circuit 63 reads the components of each color making up the print data PD from the image buffer 52 in accordance with the control signals supplied from the system controller 54, and according to these color components, drives the nozzle arrays of each color (black, yellow, magenta, cyan) making up the print head 36.
- Fig. 8 is a diagram for describing the arrangement of the nozzles in the bottom surface of the print head 36.
- the print head 36 has a black nozzle row K, and, as a color nozzle row, has a yellow nozzle row Y, a magenta nozzle row M, and a cyan nozzle row C formed in its bottom surface.
- the black nozzle row K has 180 nozzles, nozzles #1 to #180 (white circles).
- the 180 nozzles #1 to #180 (white circles) are arranged in a straight line in the sub-scanning direction shown in Fig. 2 at a constant spacing (nozzle pitch k ⁇ D).
- the yellow nozzle row Y has 60 nozzles #1 to #60 (white triangles)
- the magenta nozzle row M has 60 nozzles #1 to #60 (white squares)
- the cyan nozzle row C has 60 nozzles #1 to #60 (white diamonds).
- the 180 nozzles of these #1 to #60 nozzles (white triangles, white squares, and white diamonds) are arranged in the sub-scanning direction shown in Fig.
- D is the smallest dot pitch in the sub-scanning direction (that is, the spacing at the highest resolution of the dots formed on the print paper P). For example, if the resolution is 1440 dpi, then the spacing is 1/1440 inch (approximately 17.65 ⁇ m). Furthermore, k is an integer of 1 or more.
- each nozzle is provided with a piezo element (not shown) as a drive element for driving the nozzle and making it eject droplets of ink.
- the print paper P is carried intermittently in the sub-scanning direction by a predetermined carry amount, and between these intermittent carries the carriage 28 moves in the main-scanning direction and ink droplets are ejected from the nozzles.
- Figs. 9 and 10 are flowcharts for describing a printing method of the present embodiment.
- Fig. 11 is a schematic diagram for describing the positional relationship of the print head 36, the reflective optical sensor 29, and the print paper P when the upper left edge, in the sub-scanning direction, of the print paper P leads the upper right edge.
- Fig. 12 is a schematic diagram for describing the positional relationship between the print head 36, the reflective optical sensor 29, and the print paper P when the upper right end, in the sub-scanning direction, of the print paper P leads the upper left end by a distance less than h.
- Fig. 13 is a schematic diagram for describing Fig. 12(d) in detail.
- Fig. 14 is a schematic diagram for describing the positional relationship between the print head 36, the reflective optical sensor 29, and the print paper P when the upper right end, in the sub-scanning direction, of the print paper P leads the upper left end by a distance equal to or greater than h.
- Fig. 15 is a schematic diagram for describing Figs. 14(f) and (g) in detail. It should be noted that in Figs. 11 to Fig.
- the white circles on the upper side in the paper plane of the print head 36 indicate the black nozzle #1 and the yellow nozzle #1
- the white circles on the lower side in the paper plane of the print head 36 indicate the black nozzle #180 and the cyan nozzle #60.
- the print paper P is carried in the sub-scanning direction from the side of the black nozzle #180 and the cyan nozzle #60 shown in Fig. 8, and the reflective optical sensor 29 is arranged beside a predetermined nozzle (for instance, black nozzle #180) in the main-scanning direction.
- the system controller 54 supplies control signals for initialization to the main-scan drive circuit 61, the sub-scan drive circuit 62, and the head drive circuit 63 in accordance with the results of the decoding of initialization program data that are read from the main memory 56.
- the drive force of the CR motor 30 is conveyed to the carriage 28, then stopping it at a predetermined initial position. That is, the print head 36 also stops at the same initial position (see Fig. 11(a) and Fig. 12(a)).
- the application program 95 receives an instruction for borderless printing of a specified image from a user while the print head 36 is stopped at the initial position, then the application program 95 outputs a print command for borderless printing of the specified image to control the video driver 91 and the printer driver 96.
- the printer driver 96 receives image data specified by the user from the application program 95, and these data are supplied to the color inkjet printer 20 in the form of print data PD and various commands COM.
- the color inkjet printer 20 supplies control signals for borderless printing to the main-scan drive circuit 61, the sub-scan drive circuit 62, the head drive circuit 63, and the reflective optical sensor control circuit 65, thus executing the following sequence (S2).
- the sub-scan drive circuit 62 drives the PF motor 31 so that the print paper P stops before the stop position of the reflective optical sensor 29 in the sub-scanning direction. By doing this, the print paper P stops at a position where it does not receive the light irradiated from the reflective optical sensor 29 (see Fig. 11(a) and Fig. 12(a)). It should be noted that the rotation amount of the PF motor 31 is set so that the print paper P does not receive the light irradiated from the reflective optical sensor 29 even assuming a maximum skew of the upper edge, in the sub-scanning direction, of the print paper P (S4).
- the reflective optical sensor control circuit 65 puts the reflective optical sensor 29 into the operative state. That is, it is set into an operative state where the light-emitting member 38 emits light and the light-receiving member 40 receives the light emitted from the light-emitting member 38 and converts it into electric signals (S6).
- the system controller 54 In order to determine the position of the upper edge of the print paper P when the print paper P is stopped before the reflective optical sensor 29 in step S4, the system controller 54 writes to the RAM 57 a "0", as position information PF of the upper edge of the print paper P for when the print paper P is carried in the sub-scanning direction, and writes to a separate address of the RAM 57 a "0", as position information BF of the upper edge of the print paper P for when the print paper P is carried in the direction opposite from the sub-scanning direction (S7).
- the main-scan drive circuit 61 drives the CR motor 30 so that the print head 36 stops at a predetermined position on the left edge side of the print paper P in the main-scanning direction. In this way, the print head 36 moves from the initial position up to the predetermined position of the left edge of the print paper P and stops (see Fig. 11(b) and Fig. 12(b)). It should be noted that the predetermined position of the left edge of the print paper P is a position slightly to the right from the left edge of the print paper P (S8).
- the electric signal measuring section 66 of the reflective optical sensor control circuit 65 measures the intensity of the electric signal obtained from the light-receiving member 40 when the print head 36 is stopped at the predetermined position on the left edge of the print paper P.
- the measurement result obtained from the electric signal measuring section 66 is supplied to the system controller 54.
- the internal logic of the electric signal measuring section 66 is configured so that at normal measurement accuracy, the intensity of the electric signal when light is emitted onto the platen 26 is the logic value "H", and the intensity of the electric signal when light is emitted onto the print paper P is the logic value "L" (S10).
- the system controller 54 determines that light is emitted onto the print paper P in a state in which the upper left end, in the sub-scanning direction, of the print paper P is leading its upper right end, and supplies to the sub-scan drive circuit 62 a control signal for step-driving the PF motor 31.
- the sub-scan drive circuit 62 drives the PF motor 31 so that the print paper P is carried in units of a predetermined amount in the direction opposite from the sub-scanning direction.
- the predetermined amount at this time is an integer multiple n (n is an integer of 1 or greater) of the smallest dot pitch in the sub-scanning direction. For example, when the resolution is 1440 dpi, the predetermined amount is n/1440 inch. In this way, the print paper P is carried by the predetermined amount in the direction opposite from the sub-scanning direction (S14).
- the electric signal measuring section 66 of the reflective optical sensor control circuit 65 When the print paper P is carried in the direction opposite from the sub-scanning direction in steps S14 and S16, the electric signal measuring section 66 of the reflective optical sensor control circuit 65 once again measures the intensity of the electric signal obtained from the light-receiving member 40 when the print head 36 is stopped at the predetermined position of the left edge of the print paper P. If the measurement result obtained at this time by the electric signal measuring section 66 is the logic value "L", then the system controller 54 determines whether or not the position information BF of the upper edge of the print paper P in the RAM 57 has reached "-m/1440" (S12).
- step S14 If the position information BF of the upper edge of the print paper P in the RAM 57 has not reached "-m/1440" (m>n) (S12: NO), then the procedure is once again executed from step S14, but if the position information BF of the upper edge of the print paper P in the RAM 57 has reached "-m/1440" (S12: YES), then the system controller 54 determines that the print paper P has become, for example, jammed because of failure in the carrying mechanism, due to the fact that the light is still being irradiated on the print paper P even though the print paper P should have been carried in the direction opposite from the sub-scanning direction by m/1440 inches from the stop position of step S4.
- the reflective optical sensor control circuit 65 sets the reflective optical sensor 29 to a stopped state in which light emission and light reception are not performed (S18). Moreover, the system controller 54 supplies an error signal for alerting the user that the carrying mechanism for the print paper P has failed to, for example, display devices and speakers, which are not shown, of the color inkjet printer 20, thereby ending a series of processes (S20).
- step S10 the system controller 54 determines that light is emitted onto the platen 26 when the measurement result obtained from the electric signal measuring section 66 is the logic value "H" (S10: YES). At this time, "0" is written again (S22) only if steps S14 and S16 have been executed and the position information BF of the upper edge of the print paper P in the RAM 57 has been rewritten.
- the system controller 54 supplies a control signal for step-driving the PF motor 31 to the sub-scan drive circuit 62.
- the sub-scan drive circuit 62 drives the PF motor 31 so that the print paper P is carried in the sub-scanning direction in units of a predetermined amount.
- the predetermined amount at this time is the smallest dot pitch in the sub-scanning direction. For example, when the resolution is 1440 dpi, the predetermined amount is 1/1440 inch (approx. 17.65 ⁇ m). In this way, the print paper P is carried by the predetermined amount in the sub-scanning direction (S24).
- the electric signal measuring section 66 of the reflective optical sensor control circuit 65 again measures the intensity of the electric signal obtained from the light-receiving member 40 for when the print head 36 is stopped at the predetermined position of the left edge of the print paper P.
- the measurement result obtained by the electric signal measuring section 66 is supplied to the system controller 54.
- the system controller 54 determines whether or not the position information PF of the upper edge of the print paper P in the RAM 57 has reached "s/1440" (s>1) on the assumption that light is not being emitted onto the print paper P.
- step S30: NO If the position information PF of the upper edge of the print paper P in the RAM 57 has not reached "s/1440" (S30: NO), then the procedure is executed again from step S24, and if the position information PF of the upper edge of the print paper P in the RAM 57 has reached "s/1440" (S30: YES), then the system controller 54 determines either that the amount of light emitted from the light-emitting member 38 is no longer an appropriate amount, or that a failure of the mechanism for carrying the print paper P has occurred and the print paper P can no longer be carried in the sub-scanning direction, due to the fact that the light is being emitted on the platen 26 even though the print paper P should have been carried in the sub-scanning direction by s/1440 inches from the stop position in step S10.
- the reflective optical sensor control circuit 65 sets the reflective optical sensor 29 to a stopped state in which light emission and light reception are not performed (S32). Moreover, the system controller 54 supplies an error signal for alerting the user that the amount of light emitted by the light-emitting member 38 is not an appropriate amount, or that the carrying mechanism for the print paper P has failed, to, for example, the display devices and speakers, which are not shown, of the color inkjet printer 20, thereby ending a series of processes (S34).
- step S28 When the measurement result obtained from the electric signal measuring section 66 is the logic value "L" in step S28 (S28: YES), the system controller 54 determines that light has been irradiated onto the upper left end of the print paper P in the sub-scanning direction. At this time, if the negative branch of step S10 has been executed, then the system controller 54 determines that the upper left end, in the sub-scanning direction, of the print paper P is leading the upper right end (see Fig. 11(c)), and if the positive branch of step S10 is executed without the negative branch being executed even once, then the system controller 54 determines that the upper right end, in the sub-scanning direction, of the print paper P is leading the upper left end (see Fig. 12(c)). Also, it writes "0" to the RAM 57 as the position information PF of the upper edge of the print paper P (S36).
- the system controller 54 supplies a control signal for driving the CR motor 30 to the main-scan drive circuit 61. Also, the system controller 54 supplies to the reflective optical sensor control circuit 65 a control signal that makes it difficult for the electric signal measuring section 66 to detect light irradiated to the print paper P. It should be noted that it is possible to make it difficult for the electric signal measuring section 66 to detect the light irradiated to the print paper P through methods such as reducing the amount of light emitted from the light-emitting member 38, reducing the light receptivity of the light-receiving member 40, and changing the threshold value by which the electric signal measuring section 66 determines that light is emitted onto the print paper P.
- the predetermined position of the right edge of the print paper P is a position slightly to the left of the right edge of the print paper P.
- the electric signal measuring section 66 while making it difficult for the electric signal measuring section 66 to detect the light irradiated onto the print paper P, it begins measuring the intensity of the electric signal obtained from the light-receiving member 40 (S38). Then, the result of the measurement by the electric signal measuring section 66 is supplied to the system controller 54 (S40).
- making it difficult for the electric signal measuring section 66 to detect the light irradiated onto the print paper P is equivalent to the print head 36 beginning to move in the main-scanning direction from a predetermined position of the left side toward a predetermined position of the right side of the print paper P in a state where the print head 36 appears to have moved in the sub-scanning direction in correspondence with how difficult it has been made for the electric signal measuring section 66 to detect the light irradiated onto the print paper P.
- step S38 when the upper right end of the print paper P is leading the upper left end in the sub-scanning direction by a distance h1 ( ⁇ distance h), the electric signal measuring section 66 continues to output the logic value "H" even if the print head 36 is moved in the main-scanning direction from the predetermined position on the left side to the predetermined position on the right side, and does not detect light being irradiated to the print paper P.
- the system controller 54 executes the same process as when the upper left end of the print paper P is leading the upper right end in the sub-scanning direction, assuming that the distance h1 by which the upper right end of the print paper P leads the upper left end in the sub-scanning direction is small and will not affect borderless printing (see Fig. 13(a)).
- step S38 when the upper right end, in the sub-scanning direction, of the print paper P is leading the upper left end by a distance h2 (> distance h), the electric signal measuring section 66 outputs the logic value "L" at an intermediate point when the print head 36 has moved in the main-scanning direction from the predetermined position on the left side of the print paper P to the predetermined position on the right side, and light irradiated onto the print paper P is detected.
- the system controller 54 executes a different process from when the upper left end of the print paper P is leading the upper right end in the sub-scanning direction, assuming that the distance h2 by which the upper right end of the print paper P leads the upper left end in the sub-scanning direction is large and would affect borderless printing (see Fig. 13(b)).
- step S40 If the measurement result obtained from the electric signal measuring section 66 is the logic value "H" (S40: YES), then the system controller 54 continues the determination of step S40 until the print head 36 moves in the main-scanning direction from the predetermined position on the left side of the print paper P to the predetermined position on the right side (S42).
- the system controller 54 determines the carrying status of the print paper P to be either that the upper left end of the print paper P is leading the upper right end in the sub-scanning direction, or that the upper right end of the print paper P is leading the upper left end by the distance h1 in the sub-scanning direction. Then, the main-scan drive circuit 61 drives the CR motor 30 such that the print head 36 moves from the predetermined position on the right side of the print paper P to the predetermined position on the left side (see Fig. 11(e) and Fig. 12(e)). In this way, the print head 36 stops at the predetermined position on the left side of the print paper P (S44).
- the reflective optical sensor control circuit 65 sets the reflective optical sensor 29 to a stopped state in which light emission and light reception are not performed (S46).
- the system controller 54 supplies the sub-scan drive circuit 62 with a control signal for driving the PF motor 31.
- the print start position of the print paper P in the sub-scanning direction is determined (see Fig. 11(f) and Fig. 12(f)). Then borderless printing of the predetermined image specified by the user is performed. It should be noted that it is also possible to shorten the distance x and eject ink also on the upper side of the upper left end of the print paper P so as to reliably perform borderless printing (S48). It should be noted that it is also possible to omit the above-described step S44 and perform only the first printing movement in the main-scanning direction by moving the print head 36 from the right side of the print paper P to the left side. Also, the carrying distance of the print paper P in Fig. 11(f) and Fig. 12(f) is not limited to x. For example, depending on the various printing modes, the print paper P may be carried so that the upper left end of the print paper P is positioned at any position on #1 to #180 of the black nozzle row.
- the system controller 54 determines that the upper right end of the print paper P is leading the upper left end in the sub-scanning direction by a distance h2 (> distance h), as regards the carrying status of the print paper P. That is, it determines that there is an effect on borderless printing.
- the main-scan drive circuit 61 drives the CR motor 30 so that the print head 36 returns to the predetermined position on the left side of the print paper P.
- the print head 36 is moved up to the predetermined position on the left side from the above-mentioned intermediate point for when the print head 36 was being moved in the main-scanning direction from the predetermined position on the left side of the print paper P to the predetermined position on the right side, and the print head is then stopped. It should be noted that the print head 36 may instead ascertain the right side edge of the print paper P without moving from the above-mentioned intermediate point to the predetermined position on the left side.
- the system controller 54 supplies a control signal for driving the CR motor 30 to the main-scan drive circuit 61. Also, the system controller 54 supplies to the reflective optical sensor control circuit 65 a control signal for the electric signal measuring section 66 to detect light irradiated to the print paper P at the normal measuring accuracy. In this way, the print head 36 begins to move in the main-scanning direction from the predetermined position of the left side of the print paper P toward a predetermined position of the right side in conjunction with movement of the carriage 28 (see Fig. 14(f)). At the same time, the electric signal measuring section 66 begins measuring the intensity of the electric signal obtained from the light-receiving member 40 at the normal measuring accuracy. Then, the result of the measurement by the electric signal measuring section 66 is supplied to the system controller 54 (S102).
- step S104 determines that light is irradiated onto the print paper P. Moreover, when the system controller 54 determines that the print head 36 has not moved to the predetermined position on the right side of the print paper P (S106: NO), then the operations of step S102 and step S104 are executed again.
- the system controller 54 determines that the result of the measurement by the electric signal measuring section 66 has changed from the logic value "L" to the logic value "H,” then it is determined that the print head 36 is positioned at the right side edge of the print paper P on the assumption that movement of the carriage 28 has led to a change from the state where light is irradiated onto the print paper P to a state where light is irradiated onto the platen 26 (see Fig. 15).
- the main-scan drive circuit 61 stops driving the CR motor 30. In this way, the print head 36 stops at the position of the positive branch of step S104 or step S106 (S108).
- the main-scan drive circuit 61 drives the CR motor 30 so that the print head 36 moves in the main-scanning direction to the left from the stop position of the positive branch of step S104 or step S106 by a distance of u1.
- the distance u1 is longer than a distance u2 in the main-scanning direction between the upper right end of the print paper P and the reflective optical sensor 29 for when the upper right end, in the sub-scanning direction, of the print paper P leads the upper left end by a maximum limit.
- the print head 36 moves up to the position where the reflective optical sensor 29 is more to the left, in the main-scanning direction, than the upper right end of the print paper P and stops (see Fig. 14(g) and Fig. 15). That is, it becomes possible to later detect the upper edge of the print paper P (S110).
- the system controller 54 Since the system controller 54 determines that the reflective optical sensor 29 is irradiating light onto the print paper P, the system controller 54 supplies a control signal for driving the PF motor 31 to the sub-scan drive circuit 62.
- the sub-scan drive circuit 62 drives the PF motor 31 so that the print paper P is carried in the direction opposite from the sub-scanning direction in units of a predetermined amount.
- the predetermined amount at this time is an integer multiple n (n is an integer of 1 or greater) of the smallest dot pitch in the sub-scanning direction. For example, when the resolution is 1440 dpi, then the predetermined amount is n/1440 inch. In this way, the print paper P is carried by the predetermined amount in the direction opposite from the sub-scanning direction (S112).
- the electric signal measuring section 66 of the reflective optical sensor control circuit 65 measures the intensity of the electric signal obtained from the light-receiving member 40 for when the print head 36 is stopped at the stop position of step S110 (S116). If the measurement result obtained by the electric signal measuring section 66 at this time is the logic value "L" (S116: NO), then the system controller 54 determines whether or not the position information BF of the upper edge of the print paper P in the RAM 57 has reached "-m/1440" (S118).
- step S110 If the position information BF of the upper edge of the print paper P in the RAM 57 has not reached "-m/1440" (m>n) (S118: NO), then the procedure is once again executed from step S112, but if the position information BF of the upper edge of the print paper P in the RAM 57 has reached "-m/1440" (S118: YES), then the system controller 54 determines that the print paper P has become, for example, jammed because of failure in the mechanism for carrying the print paper P, due to the fact that the light is still being irradiated on the print paper P even though the print paper P should have been carried in the direction opposite from the sub-scanning direction by m/1440 inches from the stop position of step S110.
- the reflective optical sensor control circuit 65 sets the reflective optical sensor 29 to a stopped state in which light is not emitted or received (S120). Moreover, the system controller 54 supplies an error signal for alerting the user that the carrying mechanism for the print paper P has failed to, for example, the display devices and speakers, which are not shown, of the color inkjet printer 20, thereby ending a series of processes (S122).
- step S116 the system controller 54 determines that the reflective optical sensor 29 emits light onto the platen 26 when the measurement result obtained from the electric signal measuring section 66 is the logic value "H" (S116: YES) (see Fig. 14(h)).
- the system controller 54 supplies a control signal for step-driving the PF motor 31 to the sub-scan drive circuit 62.
- the sub-scan drive circuit 62 drives the PF motor 31 so that the print paper P is carried in the sub-scanning direction in units of a predetermined amount.
- the predetermined amount at this time is the smallest dot pitch in the sub-scanning direction. For example, when the resolution is 1440 dpi, the predetermined amount is 1/1440 inch (approx. 17.65 ⁇ m). Thus, the print paper P is carried in the sub-scanning direction by the predetermined amount (S124).
- the electric signal measuring section 66 of the reflective optical sensor control circuit 65 again measures the intensity of the electric signal obtained from the light-receiving member 40 for when the print head 36 is stopped at the predetermined position of step S110.
- the measurement result obtained by the electric signal measuring section 66 is supplied to the system controller 54. (S128)
- the system controller 54 determines whether or not the position information PF of the upper edge of the print paper P in the RAM 57 has reached "s/1440" (s>1) on the assumption that light is not emitted onto the print paper P (S130).
- step S130: NO When the position information PF of the upper edge of the print paper P in the RAM 57 has not reached "s/1440" (S130: NO), then the procedure is executed again from step S124, and when the position information PF of the upper edge of the print paper P in the RAM 57 has reached "s/1440" (S130: YES), then the system controller 54 determines either that the amount of light emitted from the light-emitting member 38 is no longer an appropriate amount, or that a failure of the mechanism for carrying the print paper P has occurred and the print paper P can no longer be carried in the sub-scanning direction, due to the fact that the light is being emitted on the platen 26 even though the print paper P should have been carried in the sub-scanning direction by s/1440 inches from the stop position of the positive branch of step S116.
- the reflective optical sensor control circuit 65 sets the reflective optical sensor 29 to a stopped state in which it does not emit or receive light (S132). Moreover, the system controller 54 supplies an error signal for alerting the user that either the amount of light emitted by the light-emitting member 38 is not an appropriate amount, or that the carrying mechanism for the print paper P has failed to, for example, the display devices and speakers, which are not shown, of the color inkjet printer 20, thereby ending a series of processes (S134).
- step S128 the system controller 54 determines that light is being irradiated onto the upper right end, in the sub-scanning direction, of the print paper P (see Fig. 14(i)).
- the system controller 54 supplies a control signal for driving the CR motor 30 to the main-scan drive circuit 61.
- the print head 36 moves in the main-scanning direction from the stopped position of step S110 up to a predetermined position of the left side of the print paper P, then moves from the predetermined position of the left side on the print paper P to the predetermined position on the right side, and then stops (see Figs. 14(i) and (k)). That is, the print start position of the print head 36 in the main-scanning direction is determined (S136, S138). It should be noted that the print head 36 does not have to return to the predetermined position on the right side.
- the main-scan drive circuit 61 stops driving the CR motor 30 (S140). Also, the reflective optical sensor control circuit 65 sets the reflective optical sensor 29 to a stopped state in which it does not emit or receive light (S142).
- the system controller 54 supplies a control signal for driving the PF motor 31 to the sub-scan drive circuit 62.
- the print start position of the print paper P in the sub-scanning direction is determined (see Fig. 14(1)). Then, borderless printing of the predetermined image specified by the user is performed. It should be noted that it is also possible to shorten the distance x and eject ink starting from the upper side of the upper left end of the print paper P so as to reliably perform borderless printing (S144). It should be noted that the carrying distance of the print paper P in Fig. 14(1) is not limited to x. For example, depending on the various printing modes, the print paper P may be carried so that the upper right end of the print paper P is positioned at any position on #1 to #180 of the black nozzle row.
- the apparatus is configured such that, when an upper end, of among the upper right end or the upper left end of the print paper P, that is on the side where the reflective optical sensor 29 is positioned is leading the other at the detection position, the print paper P is carried from that detection position in the predetermined direction by a predetermined amount.
- the print paper P is carried from the detection position in the direction opposite from the predetermined direction, then the print paper P is carried in the predetermined direction up to the detection position where the electric signal measuring section 66 detects the print paper P, and then the print paper P is carried in the predetermined direction from the detection position by a predetermined amount.
- the print start position, in the predetermined direction, of the print paper P can be determined very accurately and efficiently, and formation of blank areas at the upper edge of the print paper P and an increase in the ink-consumption amount upon borderless printing are eliminated.
- the print paper P may be carried in the predetermined direction from the detection position by the predetermined amount.
- the print paper P is carried as it is from the detection position in the predetermined direction by the predetermined amount in a case where the upper end, among the upper right end and the upper left end of the print paper P, that is on the side opposite from the side where the reflective optical sensor 29 is positioned is leading the other only by an amount that is less than the set amount at the detection position.
- the print start position, in the predetermined direction, of the print paper P can be determined very accurately and efficiently.
- this apparatus may be provided with a print head 36 for printing on the print paper P by ejecting ink as the print head moves in a main-scanning direction that intersects the carrying direction in which the print paper P is carried.
- the print start position, in the predetermined direction, of the print paper 36 can be determined very accurately and efficiently in cases where there is a print head 36 that can move in a main-scanning direction that intersects the carrying direction in which the print paper P is carried.
- the reflective optical sensor 29 may be provided together with the print head 36 in/on a carriage 28 for moving in the main-scanning direction.
- the print start position, in the predetermined direction, of the print paper P can be determined very accurately and efficiently using the reflective optical sensor 29 that is provided together with the print head 36 in/on the carriage 28.
- the upper end, among the upper right end and the upper left end of the print paper P, that is leading the other at the detection position may be found by detecting whether or not the print paper P is present by moving the reflective optical sensor 29 from the one side to the other side in the movement direction after carrying the print paper P in the predetermined direction up to the detection position where the reflective optical sensor 29 positioned on the one side in the movement direction detects the print paper P.
- the reflective optical sensor 29 may be made difficult for the reflective optical sensor 29 to detect the print paper P when the reflective optical sensor 29 is moved from the one side to the other side in the movement direction.
- the print paper P is kept from being carried in the direction opposite from the predetermined direction if the upper end, among the upper right end and the upper left end of the print paper P, that is on the side opposite from the side where the reflective optical sensor 29 is positioned is leading by less than a set amount.
- the reflective optical sensor 29 does not detect the print paper P, then it is assumed that the upper end, among the upper right end and the upper left end of the print paper P, that is on the one side in the movement direction of the reflective optical sensor 29 is leading the other at the detection position, or that the upper end, among the upper right end and the upper left end of the print paper P, that is on the other side in the movement direction of the reflective optical sensor 29 is leading the other by less than the set amount; and if the reflective optical sensor 29 detects the print paper P, then it is assumed that the upper end, among the upper right end and the upper left end of the print paper P, that is on the other side in the movement direction of the reflective optical sensor 29 is leading by at least the set amount.
- the reflective optical sensor 29 does not detect the print paper P, then it is assumed that the upper end, among the upper right end and the upper left end of the print paper P, that is on the one side in the movement direction of the reflective optical sensor 29 is leading the other at the detection position, or that the upper end, among the upper right end and the upper left end of the print paper P, that is on the other side in the movement direction of the reflective optical sensor 29 is leading the other only by an amount that is less than the set amount.
- the print paper P is kept from being carried in the direction opposite from the predetermined direction, allowing the print start position, in the predetermined direction, of the print paper P to be determined more efficiently.
- the reflective optical sensor 29 may have a light-emitting member 38 for emitting light and a light-receiving member 40 for receiving the light that is emitted by the light-emitting member 38, and may detect the print paper P based on an output value of the light-receiving member 40.
- the print start position, in the predetermined direction, of the print paper P can be determined very accurately and efficiently using the reflective optical sensor 29, which includes a light-emitting member 38 and a light-receiving member 40.
- the print head 36 may perform printing with respect to an entire surface of the print paper P.
- a print apparatus, a printing method, a program, and a computer system according to the present invention were described above according to an embodiment thereof.
- the foregoing embodiment of the invention is for the purpose of elucidating the present invention and is not to be interpreted as limiting the present invention.
- the invention can of course be altered and improved without departing from the gist thereof and includes equivalents.
- the reflective optical sensor 29 In the initial state of the color inkjet printer 20, it is also possible to position the reflective optical sensor 29 on the one side in the movement direction. This allows the operation for determining the print start position, in the sub-scanning direction, of the print paper P to be simplified. It is also possible to carry the print paper P in the sub-scanning direction while moving the reflective optical sensor 29 in the main-scanning direction, so as to detect the upper edge of the print paper P.
- the print paper P was adopted as the medium to be printed, but this is not a limitation. That is, in the present invention, it is also possible to adopt film, cloth, or thin metal plates, for example, as the medium to be printed.
- the color inkjet printer 20 with some of the functions or mechanisms of a main computer unit, a display device, an input device, a flexible disk drive device, and a CD-ROM drive device.
- the color inkjet printer 20 is provided with an image processing section for carrying out image processing, a display section for carrying out various types of displays, and a recording media attachment/detachment section to and from which recording media storing image data captured by a digital camera or the like are inserted and taken out.
- a color inkjet printer 20 was adopted, but this is not a limitation. That is, the present invention can be adopted for monochrome inkjet printers and non-inkjet type printers, for example, as well. Moreover, the present invention can be adopted for printing apparatuses such as facsimile devices and copy machines.
- the light-emitting member 38 and the light-receiving member 40 were both provided in the carriage 28 along with the print head 36, but this is not a limitation. That is, it is also possible to adopt a configuration in which the light-emitting member 38 and the light-receiving member 40 are separate of the carriage 28 and can move in synchronization with one other in the main-scanning direction. Also, the light-emitting member 38 and the light-receiving member 40 are not limited to a reflective optical sensor, and may also be a transmission-type optical sensor in which the medium to be printed is in the light path, a line sensor, or an area sensor, for example.
- the print start position, in a predetermined direction, of a medium to be printed can be determined with high precision and efficiency.
Landscapes
- Ink Jet (AREA)
- Handling Of Sheets (AREA)
- Character Spaces And Line Spaces In Printers (AREA)
- Controlling Sheets Or Webs (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
- The present invention relates to printing apparatuses, printing methods, programs, and computer systems. In particular, the present invention relates to a printing apparatus provided with detection means that is capable of moving and that is for detecting a medium to be printed, and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means, a printing method for such a printing apparatus, a program for controlling such a printing apparatus, and a computer system provided with such a printing apparatus.
- Inkjet printers that print by intermittently ejecting ink are known as printing apparatuses for printing images onto various types of media to be printed, such as paper, cloth, and film. With such inkjet printers, printing is carried out by repeating in alternation a process of positioning a medium to be printed by carrying it in a direction toward a print head, and a process of ejecting ink while moving the print head in a main-scanning direction that intersects the carrying direction in which the medium to be printed is carried.
- When carrying the medium to be printed in the direction toward the print head, if the medium is carried with either its upper right end or its upper left end leading the other, that is, if the medium to be printed is skewed in the carrying direction, then the actual print position on the medium to be printed deviates from the anticipated print position, and this affects the quality of the image. In particular, in the case of performing borderless printing, if a blank area is formed at the upper edge of the medium to be printed due to the medium to be printed being skewed in the carrying direction, there is a possibility that the medium to be printed may be rendered useless. On the other hand, when performing borderless printing, increasing the margin of the print range in order to cover the entire medium to be printed reduces the possibility that a blank area will be formed at the upper edge of the medium to be printed, but it also carries the possibility that the amount of ink that is consumed will increase.
- The present invention was arrived at in light of the foregoing issues, and it is an object thereof to achieve a printing apparatus, a printing method, a program, and a computer system with which the print start position of a medium to be printed can be determined very precisely and efficiently.
- A primary aspect of the present invention is a printing apparatus comprising: detection means that is capable of moving and that is for detecting a medium to be printed; and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means; the printing apparatus causing the detection means to be positioned on one side in the movement direction; causing the carrying means to carry the medium to be printed in a predetermined direction up to a detection position where the detection means detects the medium to be printed; and when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side opposite from a side where the detection means is positioned is leading by at least a set amount at the detection position, causing the detection means to be positioned on the other side that is opposite from the one side in the movement direction, then causing the carrying means to carry the medium to be printed from the detection position in a direction opposite from the predetermined direction, then causing the medium to be printed to be carried in the predetermined direction up to the detection position where the detection means detects the medium to be printed, and then causing the medium to be printed to be carried by a predetermined amount in the predetermined direction from the detection position.
- Features and objects of the present invention other than the above will become clear through the description of the present specification and the accompanying drawings.
-
- Fig. 1 is a block diagram showing an example configuration of a computer system of the present invention.
- Fig. 2 is a schematic perspective view showing an example
of a principal configuration of a
color inkjet printer 20 shown in Fig. 1. - Fig. 3 is a schematic diagram for describing an example of
the reflective
optical sensor 29 provided in thecarriage 28. - Fig. 4 is a diagram showing an example configuration of the
periphery of the
carriage 28 in thecolor inkjet printer 20. - Fig. 5 is an explanatory diagram of the
linear encoder 11. - Fig. 6 is a timing chart showing the waveforms of the two
types of output signals of the
linear encoder 11. - Fig. 7 is a block diagram showing an example of the
electrical configuration of the
color inkjet printer 20; - Fig. 8 is a diagram for describing the nozzle arrangement
on the bottom surface of the
print head 36. - Fig. 9 is a flowchart for describing a printing method of the present embodiment.
- Fig. 10 is a flowchart showing a continuation from Fig. 9.
- Fig. 11 is a schematic diagram for describing the positional
relationship between the
print head 36, the reflectiveoptical sensor 29, and the print paper P when the upper left end, in the sub-scanning direction, of the print paper P leads the upper right end. - Fig. 12 is a schematic diagram for describing the positional
relationship between the
print head 36, the reflectiveoptical sensor 29, and the print paper P when the upper right end, in the sub-scanning direction, of the print paper P leads the upper left end by less than a distance h. - Fig. 13 is a schematic diagram for describing Fig. 12(d) in detail.
- Fig. 14 is a schematic diagram for describing the positional
relationship between the
print head 36, the reflectiveoptical sensor 29, and the print paper P when the upper right end, in the sub-scanning direction, of the print paper P leads the upper left end by at least a distance h. - Fig. 15 is a schematic diagram for describing Figs. 14(f) and (g) in detail.
-
- A legend of the main reference numerals used in the drawings is shown below.
- 11
- linear encoder
- 12
- linear scale
- 13
- rotary encoder
- 14
- detecting section
- 20
- color inkjet printer
- 21
- CRT
- 22
- paper stacker
- 24
- paper feed roller
- 25
- pulley
- 26
- platen
- 28
- carriage
- 29
- reflective optical sensor
- 30
- carriage motor
- 31
- paper feed motor
- 32
- pull belt
- 34
- guide rail
- 36
- print head
- 38
- light-emitting member
- 40
- light-receiving member
- 50
- buffer memory
- 52
- image buffer
- 54
- system controller
- 56
- main memory
- 57
- RAM
- 58
- EEPROM
- 61
- main-scan drive circuit
- 62
- sub-scan drive circuit
- 63
- head drive circuit
- 65
- reflective optical sensor control circuit
- 66
- electric signal measuring section
- 90
- computer
- 91
- video driver
- 95
- application program
- 96
- printer driver
- 97
- resolution conversion module
- 98
- color conversion module
- 99
- halftone module
- 100
- rasterizer
- 101
- user interface display module
- 102
- UI printer interface module
- At least the following matters will be made clear by the description of the present specification and the accompanying drawings.
- A printing apparatus comprises:
- detection means that is capable of moving and that is for detecting a medium to be printed; and
- carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means;
- the printing apparatus
- causing the detection means to be positioned on one side in the movement direction;
- causing the carrying means to carry the medium to be printed in a predetermined direction up to a detection position where the detection means detects the medium to be printed; and
- when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side opposite from a side where the detection means is positioned is leading by at least a set amount at the detection position, causing the detection means to be positioned on the other side that is opposite from the one side in the movement direction, then causing the carrying means to carry the medium to be printed from the detection position in a direction opposite from the predetermined direction, then causing the medium to be printed to be carried in the predetermined direction up to the detection position where the detection means detects the medium to be printed, and then causing the medium to be printed to be carried by a predetermined amount in the predetermined direction from the detection position.
-
- According to the foregoing printing apparatus, only when an upper end, of among an upper right end or an upper left end of the medium to be printed, that is on a side opposite from a side where the detection means is positioned is leading the other by at least a set amount at the detection position, the detection means is positioned on the other side from the one side, the medium to be printed is carried from the detection position in a direction opposite from the predetermined direction, the medium to be printed is carried in the predetermined direction up to a detection position where the detection means detects the medium to be printed, and then the medium to be printed is carried by a predetermined amount in the predetermined direction from the detection position. Thus, the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently. That is, the formation of blank areas at the upper edge of the medium to be printed and an increase in ink consumption when borderless printing is performed are eliminated.
- Further, in this printing apparatus, when an upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side where the detection means is positioned is leading at the detection position, the medium to be printed may be carried by the carrying means in the predetermined direction from the detection position by the predetermined amount.
- Further, in this printing apparatus, when the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side opposite from the side where the detection means is positioned is leading by less than the set amount at the detection position, the medium to be printed may be carried by the carrying means in the predetermined direction from the detection position by the predetermined amount.
- According to the foregoing printing apparatus, the medium to be printed is carried as it is from the detection position in the predetermined direction by the predetermined amount in a case where the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side opposite from the side where the detection means is positioned is leading the other only by an amount that is less than the set amount at the detection position. Thus, the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently.
- Further, this printing apparatus may be provided with a print head for printing on the medium to be printed by ejecting ink as the print head moves in a main-scanning direction that intersects the carrying direction in which the medium to be printed is carried.
- According to the foregoing printing apparatus, the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently in cases where there is a print head that can move in a main-scanning direction that intersects the carrying direction in which the medium to be printed is carried.
- Further, in this printing apparatus, the detection means may be provided together with the print head in/on a moving member for moving in the main-scanning direction.
- According to the foregoing printing apparatus, the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently using the detection means that is provided together with the print head in/on the moving member.
- Further, in this printing apparatus, the upper end, among the upper right end and the upper left end of the medium to be printed, that is leading at the detection position may be found by detecting whether or not the medium to be printed is present by moving the detection means from the one side to the other side in the movement direction after carrying the medium to be printed in the predetermined direction up to the detection position where the detection means positioned on the one side in the movement direction detects the medium to be printed.
- According to the foregoing printing apparatus, it is possible to determine the print start position, in a predetermined direction, of the medium to be printed very accurately and efficiently using the detection means for detecting whether or not the medium to be printed is present by moving from one side to the other side in a movement direction after the medium to be printed is carried in the predetermined direction up to the detection position where the detection means positioned on the one side in the movement direction detects the medium to be printed.
- Further, in this printing apparatus, it may be made difficult for the detection means to detect the medium to be printed when the detection means is moved from the one side to the other side in the movement direction.
- According to the foregoing printing apparatus, by setting the apparatus to a setting where it is made difficult for the detection means to detect the medium to be printed, the medium to be printed is kept from being carried in the direction opposite from the predetermined direction if the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side opposite from the side where the detection means is positioned is leading by less than a set amount. Thus, it is possible to determine the print start position, in the predetermined direction, of the medium to be printed more efficiently.
- Further, in this printing apparatus, in the process of moving the detection means from the one side to the other side in the movement direction, if the detection means does not detect the medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the one side in the movement direction of the detection means is leading at the detection position, or that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the other side in the movement direction of the detection means is leading by less than the set amount; and if the detection means detects the medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the other side in the movement direction of the detection means is leading by at least the set amount.
- According to the foregoing printing apparatus, when the detection means does not detect the medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the one side in the movement direction of the detection means is leading at the detection position, or that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the other side in the movement direction of the detection means is leading only by an amount that is less than the set amount. Thus, the medium to be printed is kept from being carried in the direction opposite from the predetermined direction, allowing the print start position, in the predetermined direction, of the medium to be printed to be determined more efficiently.
- Further, in this printing apparatus, the detection means may have a light-emitting member for emitting light and a light-receiving member for receiving the light that is emitted by the light-emitting member, and may detect the medium to be printed based on an output value of the light-receiving member.
- According to the foregoing printing apparatus, the print start position, in the predetermined direction, of the medium to be printed can be determined very accurately and efficiently using the detection means, which includes a light-emitting member and a light-receiving member.
- Further, in this printing apparatus, the print head may perform printing with respect to an entire surface of the medium to be printed.
- According to the foregoing printing apparatus, it is possible to determine the print start position, in the predetermined direction, of the medium to be printed very accurately and efficiently in cases where printing is carried out with respect to the entire surface of the medium to be printed.
- It is also possible to achieve a printing apparatus comprising: detection means that is capable of moving and that is for detecting a medium to be printed; and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means;
the printing apparatus causing the detection means to be positioned on one side in the movement direction; causing the carrying means to carry the medium to be printed in a predetermined direction up to a detection position where the detection means detects the medium to be printed; when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side where the detection means is positioned is leading at the detection position, causing the medium to be printed to be carried by the carrying means in the predetermined direction from the detection position by a predetermined amount; when an upper end, among the upper right end and the upper left end of the medium to be printed, that is on a side opposite from the side where the detection means is positioned is leading by at least a set amount at the detection position, causing the detection means to be positioned on the other side that is opposite from the one side in the movement direction, then causing the carrying means to carry the medium to be printed from the detection position in a direction opposite from the predetermined direction, then causing the medium to be printed to be carried in the predetermined direction up to the detection position where the detection means detects the medium to be printed, and then causing the medium to be printed to be carried by the predetermined amount in the predetermined direction from the detection position; when the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the side opposite from the side where the detection means is positioned is leading by less than the set amount at the detection position, causing the medium to be printed to be carried by the carrying means in the predetermined direction from the detection position by the predetermined amount; printing on the medium to be printed by causing a print head to eject ink as the print head moves in a main-scanning direction that intersects the carrying direction in which the medium to be printed is carried; being provided with the detection means and the print head both in/on a moving member for moving in the main-scanning direction; finding the upper end, among the upper right end and the upper left end of the medium to be printed, that is leading at the detection position by detecting whether or not the medium to be printed is present by moving the detection means from the one side to the other side in the movement direction after carrying the medium to be printed in the predetermined direction up to the detection position where the detection means positioned on the one side in the movement direction detects the medium to be printed; when the detection means is moved from the one side to the other side in the movement direction, making it difficult for the detection means to detect the medium to be printed so that if the detection means does not detect the medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the one side in the movement direction of the detection means is leading at the detection position, or that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the other side in the movement direction of the detection means is leading by less than the set amount, and if the detection means detects the medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of the medium to be printed, that is on the other side in the movement direction of the detection means is leading by at least the set amount; and performing printing with respect to an entire surface of the medium to be printed. - Further, a printing method for a printing apparatus provided with a sensor that is capable of moving and that is for detecting a medium to be printed, and a carry roller for carrying the medium to be printed in a direction that intersects a movement direction of the sensor, comprises:
- a step of causing the sensor to be positioned on one side in the movement direction;
- a step of causing the carry roller to carry the medium to be printed in a predetermined direction up to a detection position where the sensor detects the medium to be printed; and
- a step of, when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side opposite from a side where the sensor is positioned is leading by at least a set amount at the detection position, causing the sensor to be positioned on the other side that is opposite from the one side in the movement direction, then causing the carry roller to carry the medium to be printed from the detection position in a direction opposite from the predetermined direction, then causing the medium to be printed to be carried in the predetermined direction up to the detection position where the sensor detects the medium to be printed, and then causing the medium to be printed to be carried by a predetermined amount in the predetermined direction from the detection position.
-
- The foregoing printing method allows the print start position, in the predetermined direction, of the medium to be printed to be determined very accurately and efficiently.
- Further, a program causes a printing apparatus provided with detection means that is capable of moving and that is for detecting a medium to be printed, and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means, to achieve:
- a function of causing the detection means to be positioned on one side in the movement direction;
- a function of causing the carrying means to carry the medium to be printed in a predetermined direction up to a detection position where the detection means detects the medium to be printed; and
- a function of, when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side opposite from a side where the detection means is positioned is leading by at least a set amount at the detection position, causing the detection means to be positioned on the other side that is opposite from the one side in the movement direction, then causing the carrying means to carry the medium to be printed from the detection position in a direction opposite from the predetermined direction, then causing the medium to be printed to be carried in the predetermined direction up to the detection position where the detection means detects the medium to be printed, and then causing the medium to be printed to be carried by a predetermined amount in the predetermined direction from the detection position.
-
- The foregoing program allows controlling to be executed such that the print start position, in the predetermined direction, of the medium to be printed is determined very accurately and efficiently.
- It is also possible to achieve a computer system comprising:
- a printing apparatus provided with detection means that is capable of moving and that is for detecting a medium to be printed, and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of the detection means; and
- a main computer unit that is connected to the printing apparatus;
- the computer system
- causing the detection means to be positioned on one side in the movement direction;
- causing the carrying means to carry the medium to be printed in a predetermined direction up to a detection position where the detection means detects the medium to be printed; and
- when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side opposite from a side where the detection means is positioned is leading by at least a set amount at the detection position, causing the detection means to be positioned on the other side that is opposite from the one side in the movement direction, then causing the carrying means to carry the medium to be printed from the detection position in a direction opposite from the predetermined direction, then causing the medium to be printed to be carried in the predetermined direction up to the detection position where the detection means detects the medium to be printed, and then causing the medium to be printed to be carried by a predetermined amount in the predetermined direction from the detection position.
-
- It is also possible to achieve a printing apparatus comprising:
- a sensor that is capable of moving and that is for detecting a medium to be printed; and
- a carry roller for carrying the medium to be printed in a direction that intersects a movement direction of the sensor;
- the printing apparatus
- causing the sensor to be positioned on one side in the movement direction;
- causing the carry roller to carry the medium to be printed in a predetermined direction up to a detection position where the sensor detects the medium to be printed; and
- when an upper end, among an upper right end and an upper left end of the medium to be printed, that is on a side opposite from a side where the sensor is positioned is leading by at least a set amount at the detection position, causing the sensor to be positioned on the other side that is opposite from the one side in the movement direction, then causing the carry roller to carry the medium to be printed from the detection position in a direction opposite from the predetermined direction, then causing the medium to be printed to be carried in the predetermined direction up to the detection position where the sensor detects the medium to be printed, and then causing the medium to be printed to be carried by a predetermined amount in the predetermined direction from the detection position.
-
- An overview of a color inkjet printer serving as an example of a printing apparatus is described below with reference to Fig. 1. Fig. 1 is a block diagram showing an example configuration of a computer system of the present invention. In Fig. 1, a
color inkjet printer 20 serves as the printing apparatus, and a computer system is constituted by thecolor inkjet printer 20, acomputer 90, a display device (such as aCRT 21 or a LCD that is not shown), input devices (such as a keyboard and a mouse that are not shown), and a drive device (such as a flexible drive device or a CD-ROM drive device that are not shown). - The
computer 90 has avideo driver 91 for driving display of theCRT 21, aprinter driver 96 for driving printing of thecolor inkjet printer 20, and anapplication program 95 for controlling driving of thevideo driver 91 and theprinter driver 96. In accordance with a display command from theapplication program 95, thevideo driver 91 suitably processes image data to be processed and supplies them to theCRT 21. TheCRT 21 displays an image corresponding to the image data supplied from thevideo driver 91. Also, in accordance with a print command from theapplication program 95, theprinter driver 96 suitably processes image data to be processed and supplies them to thecolor inkjet printer 20 as print data PD. - The
printer driver 96 is provided with aresolution conversion module 97, acolor conversion module 98, ahalftone module 99, arasterizer 100, a userinterface display module 101, a UIprinter interface module 102, and a color conversion lookup table LUT. - The
resolution conversion module 97 converts the resolution of the color image data formed based on theapplication program 95 into a resolution for printing. It should be noted that the color image data after conversion by thecolor conversion module 97 are made of the three color components RGB. Therefore, thecolor conversion module 98 references the color conversion lookup table LUT and converts, pixel by pixel, the RGB color image data having been output from theresolution conversion module 97 into multi-gradation data of a plurality of ink colors that can be used by thecolor inkjet printer 20. It should be noted that the multi-gradation data after conversion by thecolor conversion module 98 have a gradation value of 256 grades, for example. Thehalftone module 99 executes halftone processing with respect to the multi-gradation data that are output from thecolor conversion module 98 to create halftone image data. Therasterizer 100 arranges the halftone image data having been output from thehalftone module 99 into a data order for supplying to thecolor inkjet printer 20, and supplies them to thecolor inkjet printer 20 as the print data PD mentioned above. It should be noted that the print data PD include raster data indicating how dots are to be formed when the print head moves in the main-scanning direction, and data indicating the carry amount by which to successively move the medium to be printed in the sub-scanning direction, which intersects the main-scanning direction. - The user
interface display module 101 has a function for displaying various windows related to printing and a function for receiving instructions input from the user through these windows. - The UI
printer interface module 102 is positioned between the userinterface display module 101 and thecolor inkjet printer 20, and serves as a two-way interface between them. That is, when a user gives an instruction to the userinterface display module 101, the UIprinter interface module 102 serves as an interface by decoding commands from the userinterface display module 101 and sending the various commands COM that are obtained to thecolor inkjet printer 20. Conversely, the UIprinter interface module 102 also serves as an interface in the other direction by supplying various commands COM from thecolor inkjet printer 20 to the userinterface display module 101. - As described above, the
printer driver 96 achieves a function for supplying print data PD to thecolor inkjet printer 20 and a function for sending and receiving various types of commands COM to and from thecolor inkjet printer 20. It should be noted that a program for achieving the functions of theprinter driver 96 is supplied to thecomputer 90 in a format in which it is stored on any one of various computer-readable storage media, including flexible disks, CD-ROMs, magneto optical disks, IC cards, ROM cartridges, punch cards, printed materials on which a code such as a bar code is printed, and internal storage devices and external storage devices of a computer. The program for achieving the functions of theprinter driver 96 can also be downloaded onto thecomputer 90 from, for example, a publicly available WWW (World Wide Web) server on the Internet. - Fig. 2 is a schematic perspective view showing an example of the primary structures of the
color inkjet printer 20 shown in Fig. 1. Thecolor inkjet printer 20 is provided with apaper stacker 22, apaper feed roller 24 driven by a step motor that is not shown, aplaten 26, acarriage 28 serving as a moving member, acarriage motor 30, apull belt 32 that transmits the drive force of thecarriage motor 30, andguide rails 34 for guiding thecarriage 28. Also, thecarriage 28 is provided with aprint head 36 that has numerous nozzles for forming dots, and a reflectiveoptical sensor 29 serving as a light-emitting member and a light-receiving member that will be described in detail later. - The
carriage 28 is pulled by thepull belt 32, to which the drive force of thecarriage motor 30 is transmitted, and moves in the main-scanning direction as shown in Fig. 2 along the guide rails 34. The print paper P is drawn from thepaper stacker 22 and then rolled by the paper feed roller (also referred to as the "carry roller") 24, which is an example of the carrying means, and carried in the sub-scanning direction, which is perpendicular to the main-scanning direction shown in Fig. 2, over the surface of theplaten 26. It should be noted that thepaper feed roller 24 is driven when the operation for supplying the print paper P from thepaper stacker 22 onto theplaten 26 and the operation for discharging the print paper P from theplaten 26 are performed. - Fig. 3 is a schematic diagram for describing an example of the reflective
optical sensor 29 provided in thecarriage 28. The reflectiveoptical sensor 29 has a light-emittingmember 38 such as a light-emitting diode that emits light, and a light-receivingmember 40 such as a phototransistor for receiving the light that is emitted by the light-emitting member. It should be noted that the light-emittingmember 38 is not limited to the light-emitting diode mentioned above, and any member may be adopted as the light-emittingmember 38 as long as the member can constitute an element for achieving the present invention by emitting light. Also, the light-receivingmember 40 is not limited to the phototransistor mentioned above, and any member may be adopted as the light-receivingmember 40 as long as the member can constitute an element for achieving the present invention by receiving the light from the light-emittingmember 38. - The incident light that is emitted by the light-emitting
member 38 has directionality, and if there is print paper P in the direction of incidence, then it is irradiated onto the print paper P, whereas if there is no print paper P in the direction of incidence, then it is irradiated onto theplaten 26. The incident light that is irradiated onto the print paper P or theplaten 26 is reflected, and the light that is reflected at this time is received by the light-receivingmember 40 and converted into an electric signal as an output value corresponding to the intensity of the reflected light. That is, since the intensity of light reflected by the print paper P and theplaten 26 is different, it is possible to determine whether or not the print paper P is in the direction of incidence of the reflectiveoptical sensor 29 based on the intensity of the electric signal that is obtained from the light-receivingmember 40. The intensity of the electric signal that is obtained from the light-receivingmember 40 is measured by an electricsignal measuring section 66, which is described later. - It should be noted that in this embodiment, the reflective
optical sensor 29 is a single unit constituted by the light-emittingmember 38 and the light-receivingmember 40, but this is not a limitation. That is, it is also possible to adopt a configuration in which the light-emittingmember 38 and the light-receiving member are separate members making up the reflectiveoptical sensor 29, and this reflectiveoptical sensor 29 is provided in/on thecarriage 28. - Also, the electric signal corresponding to the intensity of the reflected light obtained from the light-receiving
member 40 is measured in this embodiment, but this is not a limitation. That is, it is also possible to provide a means capable of measuring the intensity of the reflected light received by the light-receivingmember 40 in a form other than an electric signal. - Fig. 4 is a diagram showing an example of a configuration of the periphery of the
carriage 28 in thecolor inkjet printer 20. Thecolor inkjet printer 20 is provided with a paper feed motor (hereinafter referred to as "PF motor") 31 for carrying the print paper P, thecarriage 28 in which theprint head 36 for ejecting ink onto the print paper P is provided and which moves in the main-scanning direction, the carriage motor (hereinafter referred to as "CR motor") 30 for driving thecarriage 28, alinear encoder 11 provided in thecarriage 28, alinear scale 12 in which slits are formed at a predetermined spacing, theplaten 26 for supporting the print paper P, thepaper feed roller 24 to which the drive force of thePF motor 31 is transferred and which is for carrying the print paper P in the sub-scanning direction, arotary encoder 13 for detecting the amount of rotation of the paper feed roller 24 (see Fig. 7), apulley 25 provided about the rotational shaft of theCR motor 30, and thepull belt 32 stretched taut by thepulley 25. - Fig. 5 is an explanatory diagram of the
linear encoder 11. - The
linear encoder 11 is for detecting the position of thecarriage 28, and has alinear scale 12 and a detectingsection 14. - The
linear scale 12 is provided with slits at a predetermined spacing (for example, 1/180 inch (1 inch = 2.54 cm)), and is fastened to thecolor inkjet printer 20 side. - The detecting
section 14 is provided in opposition to thelinear scale 12 and on thecarriage 28 side. The detectingsection 14 has a light-emittingdiode 11a, acollimating lens 11b, and adetection processing section 11c. Thedetection processing section 11c has a plurality (for example, four)photodiodes 11d, asignal processing circuit 11e, and two comparators 11fA and 11fB. - The light-emitting
diode 11a emits light when a voltage Vcc is applied to it via resistors on the anode side. This light is incident on thecollimating lens 11b. Thecollimating lens 11b turns the light emitted from the light-emittingdiode 11a into parallel light, and irradiates the parallel light onto thelinear scale 12. The parallel light that passes through the slits provided in thelinear scale 12 passes through stationary slits that are not shown and is incident on thephotodiodes 11d. Thephotodiodes 11d convert the incident light into electric signals. The electric signals that are output from thephotodiodes 11d are compared in the comparators 11fA and 11fB and the results of these comparisons are output as pulses. Then, the pulse ENC-A and the pulse ENC-B that are output from the comparators 11fA and 11fB become the output of thelinear encoder 11. - Fig. 6 is a timing chart showing the waveforms of the two types of output signals of the
linear encoder 11. Fig. 6(a) is a timing chart of the waveform of the output signal when theCR motor 30 is rotating forward. Fig. 6(b) is a timing chart showing the waveform of the output signal when theCR motor 30 is rotating in reverse. - As shown in Fig. 6(a) and Fig. 6(b), the phases of the pulse ENC-A and the pulse ENC-B are misaligned by 90 degrees both when the
CR motor 30 is rotating forward and when it is rotating in reverse. When theCR motor 30 is rotating forward, that is, when thecarriage 28 is moving in the main-scanning direction, then, as shown in Fig. 6(a), the phase of the pulse ENC-A leads the phase of the pulse ENC-B by 90 degrees. On the other hand, when theCR motor 30 is rotating in reverse, then, as shown in Fig. 6(b), the phase of the pulse ENC-A is delayed by 90 degrees with respect to the phase of the pulse ENC-B. A single period T of each pulse is equivalent to the time during which thecarriage 28 is moved by the slit spacing of the linear scale 12 (for example, 1/180 inch (1 inch = 2.54 cm)). - The position of the
carriage 28 is detected as follows. First, the rising edges or the falling edges of the pulse ENC-A or ENC-B are detected, and the number of detected edges is counted. The position of thecarriage 28 is calculated based on the counted number. With respect to the counted number, when theCR motor 30 is rotating forward, a "+1" is added for each detected edge, and when theCR motor 30 is rotating in reverse, a "-1" is added for each detected edge. The period of the pulses ENC is equal to the slit spacing of thelinear scale 12, and thus, if the counted number is multiplied by the slit spacing, then the amount of movement from the position of thecarriage 28 when to the count number is "0" can be obtained. That is, the resolution of thelinear encoder 11 in this case is the slit spacing of thelinear scale 12. It is also possible to use both the pulse ENC-A and the pulse ENC-B to detect the position of thecarriage 30. The periods of the pulses ENC-A and ENC-B are equal to the slit spacing of thelinear scale 12, and the phases of the pulse ENC-A and the pulse ENC-B differ by 90 degrees, so that by detecting the rising edges and the fallings edges of each pulse and counting the number of detected edges, a count number of "1" corresponds to 1/4 of the slit spacing of thelinear scale 12. Therefore, if the count number is multiplied by 1/4 of the slit spacing, then the amount of movement from the position of thecarriage 28 when the count number is "0" can be obtained. That is, the resolution of thelinear encoder 11 in this case is 1/4 the slit spacing of thelinear scale 12. - It should be noted that the
rotary encoder 13 has substantially the same configuration as thelinear encoder 11, except that a not-shown rotation disk that rotates in conjunction with rotation of thepaper feed roller 24 is used in place of thelinear scale 12 provided on thecolor inkjet printer 20 side. - Fig. 7 is a block diagram showing an example of the electrical configuration of the
color inkjet printer 20. In thecolor inkjet printer 20, abuffer memory 50 is for temporarily storing the signals supplied from thecomputer 90. Animage buffer 52 is where the print data PD, of among the signals stored in thebuffer memory 50, are supplied. Asystem controller 54 is where the various commands COM, of among the signals stored in thebuffer memory 50, for controlling the operation of thecolor inkjet printer 20 are supplied. - The
main memory 56 stores, in beforehand, program data for controlling the operation of thecolor inkjet printer 20 without regard to the interface between thecomputer 90 and thebuffer memory 50, and a data table that can be referenced when controlling the operation of thecolor inkjet printer 20, for example, and is connected to thesystem controller 54. It should be noted that as themain memory 56 it is possible to adopt a nonvolatile memory (such as a mask ROM to which data are burned and fixed during manufacturing, an EPROM whose data can be erased with ultraviolet light, and an EEPROM with which data can be rewritten electrically) or a volatile memory (such as an SRAM that can hold data with the backup power source), but it is preferable that a nonvolatile memory is adopted because data can be reliably held. - The
EEPROM 58 stores rewritten information, such as the remaining ink amount, that changes each time the printing operation is performed, and is connected to thesystem controller 54. - Moreover, the
system controller 54 is connected to aRAM 57 for storing working data, a main-scan drive circuit 61 for driving theCR motor 30, asub-scan drive circuit 62 for driving thePF motor 31, ahead drive circuit 63 for driving theprint head 36, a reflective opticalsensor control circuit 65 for controlling the light-emittingmember 38 and the light-receivingmember 40 making up the reflectiveoptical sensor 29, thelinear encoder 11, and therotary encoder 13. It should be noted that the reflective opticalsensor control circuit 65 has an electricsignal measuring section 66 for measuring the electric signals corresponding to the intensity of the reflected light obtained from the light-receivingmember 40. - As detailed above, the
system controller 54 decodes the various commands COM supplied from thebuffer memory 50, and suitably supplies the command signals obtained as the result of this decoding to the main-scan drive circuit 61, thesub-scan drive circuit 62, and thehead drive circuit 63, for example. In particular, thehead drive circuit 63 reads the components of each color making up the print data PD from theimage buffer 52 in accordance with the control signals supplied from thesystem controller 54, and according to these color components, drives the nozzle arrays of each color (black, yellow, magenta, cyan) making up theprint head 36. - Fig. 8 is a diagram for describing the arrangement of the nozzles in the bottom surface of the
print head 36. Theprint head 36 has a black nozzle row K, and, as a color nozzle row, has a yellow nozzle row Y, a magenta nozzle row M, and a cyan nozzle row C formed in its bottom surface. - The black nozzle row K has 180 nozzles,
nozzles # 1 to #180 (white circles). The 180nozzles # 1 to #180 (white circles) are arranged in a straight line in the sub-scanning direction shown in Fig. 2 at a constant spacing (nozzle pitch k·D). Furthermore, the yellow nozzle row Y has 60nozzles # 1 to #60 (white triangles), the magenta nozzle row M has 60nozzles # 1 to #60 (white squares), and the cyan nozzle row C has 60nozzles # 1 to #60 (white diamonds). The 180 nozzles of these #1 to #60 nozzles (white triangles, white squares, and white diamonds) are arranged in the sub-scanning direction shown in Fig. 2 in a straight line at a constant spacing (nozzle pitch k·D). Here D is the smallest dot pitch in the sub-scanning direction (that is, the spacing at the highest resolution of the dots formed on the print paper P). For example, if the resolution is 1440 dpi, then the spacing is 1/1440 inch (approximately 17.65 µm). Furthermore, k is an integer of 1 or more. - For example, each nozzle is provided with a piezo element (not shown) as a drive element for driving the nozzle and making it eject droplets of ink.
- It should be noted that, during printing, the print paper P is carried intermittently in the sub-scanning direction by a predetermined carry amount, and between these intermittent carries the
carriage 28 moves in the main-scanning direction and ink droplets are ejected from the nozzles. - Next, a printing method of the present embodiment will be described using Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, and Fig. 15. Figs. 9 and 10 are flowcharts for describing a printing method of the present embodiment. Fig. 11 is a schematic diagram for describing the positional relationship of the
print head 36, the reflectiveoptical sensor 29, and the print paper P when the upper left edge, in the sub-scanning direction, of the print paper P leads the upper right edge. Fig. 12 is a schematic diagram for describing the positional relationship between theprint head 36, the reflectiveoptical sensor 29, and the print paper P when the upper right end, in the sub-scanning direction, of the print paper P leads the upper left end by a distance less than h. Fig. 13 is a schematic diagram for describing Fig. 12(d) in detail. Fig. 14 is a schematic diagram for describing the positional relationship between theprint head 36, the reflectiveoptical sensor 29, and the print paper P when the upper right end, in the sub-scanning direction, of the print paper P leads the upper left end by a distance equal to or greater than h. Fig. 15 is a schematic diagram for describing Figs. 14(f) and (g) in detail. It should be noted that in Figs. 11 to Fig. 15, the white circles on the upper side in the paper plane of theprint head 36 indicate theblack nozzle # 1 and theyellow nozzle # 1, and the white circles on the lower side in the paper plane of theprint head 36 indicate theblack nozzle # 180 and thecyan nozzle # 60. Furthermore, when printing is performed, the print paper P is carried in the sub-scanning direction from the side of theblack nozzle # 180 and thecyan nozzle # 60 shown in Fig. 8, and the reflectiveoptical sensor 29 is arranged beside a predetermined nozzle (for instance, black nozzle #180) in the main-scanning direction. - First, when the power is turned on, the
system controller 54 supplies control signals for initialization to the main-scan drive circuit 61, thesub-scan drive circuit 62, and thehead drive circuit 63 in accordance with the results of the decoding of initialization program data that are read from themain memory 56. In this way, the drive force of theCR motor 30 is conveyed to thecarriage 28, then stopping it at a predetermined initial position. That is, theprint head 36 also stops at the same initial position (see Fig. 11(a) and Fig. 12(a)). - If the
application program 95 receives an instruction for borderless printing of a specified image from a user while theprint head 36 is stopped at the initial position, then theapplication program 95 outputs a print command for borderless printing of the specified image to control thevideo driver 91 and theprinter driver 96. By doing this, theprinter driver 96 receives image data specified by the user from theapplication program 95, and these data are supplied to thecolor inkjet printer 20 in the form of print data PD and various commands COM. In accordance with the print data PD and the various commands COM, thecolor inkjet printer 20 supplies control signals for borderless printing to the main-scan drive circuit 61, thesub-scan drive circuit 62, thehead drive circuit 63, and the reflective opticalsensor control circuit 65, thus executing the following sequence (S2). - The
sub-scan drive circuit 62 drives thePF motor 31 so that the print paper P stops before the stop position of the reflectiveoptical sensor 29 in the sub-scanning direction. By doing this, the print paper P stops at a position where it does not receive the light irradiated from the reflective optical sensor 29 (see Fig. 11(a) and Fig. 12(a)). It should be noted that the rotation amount of thePF motor 31 is set so that the print paper P does not receive the light irradiated from the reflectiveoptical sensor 29 even assuming a maximum skew of the upper edge, in the sub-scanning direction, of the print paper P (S4). - The reflective optical
sensor control circuit 65 puts the reflectiveoptical sensor 29 into the operative state. That is, it is set into an operative state where the light-emittingmember 38 emits light and the light-receivingmember 40 receives the light emitted from the light-emittingmember 38 and converts it into electric signals (S6). - In order to determine the position of the upper edge of the print paper P when the print paper P is stopped before the reflective
optical sensor 29 in step S4, thesystem controller 54 writes to the RAM 57 a "0", as position information PF of the upper edge of the print paper P for when the print paper P is carried in the sub-scanning direction, and writes to a separate address of the RAM 57 a "0", as position information BF of the upper edge of the print paper P for when the print paper P is carried in the direction opposite from the sub-scanning direction (S7). - The main-
scan drive circuit 61 drives theCR motor 30 so that theprint head 36 stops at a predetermined position on the left edge side of the print paper P in the main-scanning direction. In this way, theprint head 36 moves from the initial position up to the predetermined position of the left edge of the print paper P and stops (see Fig. 11(b) and Fig. 12(b)). It should be noted that the predetermined position of the left edge of the print paper P is a position slightly to the right from the left edge of the print paper P (S8). - The electric
signal measuring section 66 of the reflective opticalsensor control circuit 65 measures the intensity of the electric signal obtained from the light-receivingmember 40 when theprint head 36 is stopped at the predetermined position on the left edge of the print paper P. The measurement result obtained from the electricsignal measuring section 66 is supplied to thesystem controller 54. It should be noted that, as for the measurement result obtained from the electricsignal measuring section 66, the internal logic of the electricsignal measuring section 66 is configured so that at normal measurement accuracy, the intensity of the electric signal when light is emitted onto theplaten 26 is the logic value "H", and the intensity of the electric signal when light is emitted onto the print paper P is the logic value "L" (S10). - When the measurement result obtained from the electric
signal measuring section 66 is the logic value "L" (S10: NO), thesystem controller 54 determines that light is emitted onto the print paper P in a state in which the upper left end, in the sub-scanning direction, of the print paper P is leading its upper right end, and supplies to the sub-scan drive circuit 62 a control signal for step-driving thePF motor 31. - The
sub-scan drive circuit 62 drives thePF motor 31 so that the print paper P is carried in units of a predetermined amount in the direction opposite from the sub-scanning direction. It should be noted that the predetermined amount at this time is an integer multiple n (n is an integer of 1 or greater) of the smallest dot pitch in the sub-scanning direction. For example, when the resolution is 1440 dpi, the predetermined amount is n/1440 inch. In this way, the print paper P is carried by the predetermined amount in the direction opposite from the sub-scanning direction (S14). - Based on the fact that the print paper P was carried by the predetermined amount (for instance, n/1440 inch) in the direction opposite from the sub-scanning direction, the
system controller 54 writes the position information BF of the upper edge of the print paper P as "0-n/1440" = "-n/1440" to theRAM 57. That is, theoretically, the print paper P is successively carried in the direction opposite from the sub-scanning direction from the stop position of step S4 in units of n/1440 inch (S16). - When the print paper P is carried in the direction opposite from the sub-scanning direction in steps S14 and S16, the electric
signal measuring section 66 of the reflective opticalsensor control circuit 65 once again measures the intensity of the electric signal obtained from the light-receivingmember 40 when theprint head 36 is stopped at the predetermined position of the left edge of the print paper P. If the measurement result obtained at this time by the electricsignal measuring section 66 is the logic value "L", then thesystem controller 54 determines whether or not the position information BF of the upper edge of the print paper P in theRAM 57 has reached "-m/1440" (S12). - If the position information BF of the upper edge of the print paper P in the
RAM 57 has not reached "-m/1440" (m>n) (S12: NO), then the procedure is once again executed from step S14, but if the position information BF of the upper edge of the print paper P in theRAM 57 has reached "-m/1440" (S12: YES), then thesystem controller 54 determines that the print paper P has become, for example, jammed because of failure in the carrying mechanism, due to the fact that the light is still being irradiated on the print paper P even though the print paper P should have been carried in the direction opposite from the sub-scanning direction by m/1440 inches from the stop position of step S4. Thus, the reflective opticalsensor control circuit 65 sets the reflectiveoptical sensor 29 to a stopped state in which light emission and light reception are not performed (S18). Moreover, thesystem controller 54 supplies an error signal for alerting the user that the carrying mechanism for the print paper P has failed to, for example, display devices and speakers, which are not shown, of thecolor inkjet printer 20, thereby ending a series of processes (S20). - In step S10, the
system controller 54 determines that light is emitted onto theplaten 26 when the measurement result obtained from the electricsignal measuring section 66 is the logic value "H" (S10: YES). At this time, "0" is written again (S22) only if steps S14 and S16 have been executed and the position information BF of the upper edge of the print paper P in theRAM 57 has been rewritten. - Then, the
system controller 54 supplies a control signal for step-driving thePF motor 31 to thesub-scan drive circuit 62. Thesub-scan drive circuit 62 drives thePF motor 31 so that the print paper P is carried in the sub-scanning direction in units of a predetermined amount. It should be noted that the predetermined amount at this time is the smallest dot pitch in the sub-scanning direction. For example, when the resolution is 1440 dpi, the predetermined amount is 1/1440 inch (approx. 17.65 µm). In this way, the print paper P is carried by the predetermined amount in the sub-scanning direction (S24). - Based on the fact that the print paper P was carried in the sub-scanning direction by the predetermined amount (for instance, 1/1440 inch), the
system controller 54 writes the position information PF of the upper edge of the print paper P to theRAM 57 as "0+1/1440" = "1/1440". That is, theoretically, the print paper P is successively carried in the sub-scanning direction from the stop position in step S10 in units of 1/1440 inch (S26). - The electric
signal measuring section 66 of the reflective opticalsensor control circuit 65 again measures the intensity of the electric signal obtained from the light-receivingmember 40 for when theprint head 36 is stopped at the predetermined position of the left edge of the print paper P. The measurement result obtained by the electricsignal measuring section 66 is supplied to thesystem controller 54. (S28) - If the measurement result obtained by the electric
signal measuring section 66 is the logic value "H" (S28: NO), then thesystem controller 54 determines whether or not the position information PF of the upper edge of the print paper P in theRAM 57 has reached "s/1440" (s>1) on the assumption that light is not being emitted onto the print paper P. - If the position information PF of the upper edge of the print paper P in the
RAM 57 has not reached "s/1440" (S30: NO), then the procedure is executed again from step S24, and if the position information PF of the upper edge of the print paper P in theRAM 57 has reached "s/1440" (S30: YES), then thesystem controller 54 determines either that the amount of light emitted from the light-emittingmember 38 is no longer an appropriate amount, or that a failure of the mechanism for carrying the print paper P has occurred and the print paper P can no longer be carried in the sub-scanning direction, due to the fact that the light is being emitted on theplaten 26 even though the print paper P should have been carried in the sub-scanning direction by s/1440 inches from the stop position in step S10. In this way, the reflective opticalsensor control circuit 65 sets the reflectiveoptical sensor 29 to a stopped state in which light emission and light reception are not performed (S32). Moreover, thesystem controller 54 supplies an error signal for alerting the user that the amount of light emitted by the light-emittingmember 38 is not an appropriate amount, or that the carrying mechanism for the print paper P has failed, to, for example, the display devices and speakers, which are not shown, of thecolor inkjet printer 20, thereby ending a series of processes (S34). - When the measurement result obtained from the electric
signal measuring section 66 is the logic value "L" in step S28 (S28: YES), thesystem controller 54 determines that light has been irradiated onto the upper left end of the print paper P in the sub-scanning direction. At this time, if the negative branch of step S10 has been executed, then thesystem controller 54 determines that the upper left end, in the sub-scanning direction, of the print paper P is leading the upper right end (see Fig. 11(c)), and if the positive branch of step S10 is executed without the negative branch being executed even once, then thesystem controller 54 determines that the upper right end, in the sub-scanning direction, of the print paper P is leading the upper left end (see Fig. 12(c)). Also, it writes "0" to theRAM 57 as the position information PF of the upper edge of the print paper P (S36). - The
system controller 54 supplies a control signal for driving theCR motor 30 to the main-scan drive circuit 61. Also, thesystem controller 54 supplies to the reflective optical sensor control circuit 65 a control signal that makes it difficult for the electricsignal measuring section 66 to detect light irradiated to the print paper P. It should be noted that it is possible to make it difficult for the electricsignal measuring section 66 to detect the light irradiated to the print paper P through methods such as reducing the amount of light emitted from the light-emittingmember 38, reducing the light receptivity of the light-receivingmember 40, and changing the threshold value by which the electricsignal measuring section 66 determines that light is emitted onto the print paper P. However, as long as the result is that it becomes difficult for the electricsignal measuring section 66 to detect the light irradiated onto the print paper P, methods other than those described above may also be adopted. For example, it is also possible to adopt a method in which the above-described light receptivity and threshold value are retained while the print paper P is carried in the direction opposite from the sub-scanning direction by a predetermined amount (for instance, distance h). In this way, theprint head 36 begins to move, in the main-scanning direction, from the predetermined position of the left edge of the print paper P toward a predetermined position of the right edge in conjunction with movement of the carriage 28 (see Fig. 11(d) and Fig. 12(d)). It should be noted that the predetermined position of the right edge of the print paper P is a position slightly to the left of the right edge of the print paper P. At the same time, while making it difficult for the electricsignal measuring section 66 to detect the light irradiated onto the print paper P, it begins measuring the intensity of the electric signal obtained from the light-receiving member 40 (S38). Then, the result of the measurement by the electricsignal measuring section 66 is supplied to the system controller 54 (S40). - Specifically, making it difficult for the electric
signal measuring section 66 to detect the light irradiated onto the print paper P is equivalent to theprint head 36 beginning to move in the main-scanning direction from a predetermined position of the left side toward a predetermined position of the right side of the print paper P in a state where theprint head 36 appears to have moved in the sub-scanning direction in correspondence with how difficult it has been made for the electricsignal measuring section 66 to detect the light irradiated onto the print paper P. - For example, in step S38, when the upper right end of the print paper P is leading the upper left end in the sub-scanning direction by a distance h1 (< distance h), the electric
signal measuring section 66 continues to output the logic value "H" even if theprint head 36 is moved in the main-scanning direction from the predetermined position on the left side to the predetermined position on the right side, and does not detect light being irradiated to the print paper P. In other words, thesystem controller 54 executes the same process as when the upper left end of the print paper P is leading the upper right end in the sub-scanning direction, assuming that the distance h1 by which the upper right end of the print paper P leads the upper left end in the sub-scanning direction is small and will not affect borderless printing (see Fig. 13(a)). - On the other hand, in step S38, when the upper right end, in the sub-scanning direction, of the print paper P is leading the upper left end by a distance h2 (> distance h), the electric
signal measuring section 66 outputs the logic value "L" at an intermediate point when theprint head 36 has moved in the main-scanning direction from the predetermined position on the left side of the print paper P to the predetermined position on the right side, and light irradiated onto the print paper P is detected. In other words, thesystem controller 54 executes a different process from when the upper left end of the print paper P is leading the upper right end in the sub-scanning direction, assuming that the distance h2 by which the upper right end of the print paper P leads the upper left end in the sub-scanning direction is large and would affect borderless printing (see Fig. 13(b)). - If the measurement result obtained from the electric
signal measuring section 66 is the logic value "H" (S40: YES), then thesystem controller 54 continues the determination of step S40 until theprint head 36 moves in the main-scanning direction from the predetermined position on the left side of the print paper P to the predetermined position on the right side (S42). - When the measurement result obtained from the electric
signal measuring section 66 is the logic value "H" (S42: YES) from the predetermined position on the left side of the print paper P up to the predetermined position on the right side, thesystem controller 54 determines the carrying status of the print paper P to be either that the upper left end of the print paper P is leading the upper right end in the sub-scanning direction, or that the upper right end of the print paper P is leading the upper left end by the distance h1 in the sub-scanning direction. Then, the main-scan drive circuit 61 drives theCR motor 30 such that theprint head 36 moves from the predetermined position on the right side of the print paper P to the predetermined position on the left side (see Fig. 11(e) and Fig. 12(e)). In this way, theprint head 36 stops at the predetermined position on the left side of the print paper P (S44). - The reflective optical
sensor control circuit 65 sets the reflectiveoptical sensor 29 to a stopped state in which light emission and light reception are not performed (S46). - The
system controller 54 supplies thesub-scan drive circuit 62 with a control signal for driving thePF motor 31. Thesub-scan drive circuit 62 drives thePF motor 31 so that the upper left end of the print paper P is at the foremost position of the print head 36 (position of theblack nozzle # 1 and the yellow nozzle #1). In this way, the print paper P is carried in the sub-scanning direction by a distance x (= 179 kD), which is the distance from #1 to #180 of the black nozzle row K of theprint head 36, and the upper left end of the print paper P is positioned on the same line as the foremost position of theprint head 36 in the main-scanning direction. In other words, the print start position of the print paper P in the sub-scanning direction is determined (see Fig. 11(f) and Fig. 12(f)). Then borderless printing of the predetermined image specified by the user is performed. It should be noted that it is also possible to shorten the distance x and eject ink also on the upper side of the upper left end of the print paper P so as to reliably perform borderless printing (S48). It should be noted that it is also possible to omit the above-described step S44 and perform only the first printing movement in the main-scanning direction by moving theprint head 36 from the right side of the print paper P to the left side. Also, the carrying distance of the print paper P in Fig. 11(f) and Fig. 12(f) is not limited to x. For example, depending on the various printing modes, the print paper P may be carried so that the upper left end of the print paper P is positioned at any position on #1 to #180 of the black nozzle row. - Incidentally, when the measurement result obtained from the electric
signal measuring section 66 changes to the logic value "L" (S40: NO) at an intermediate point as theprint head 36 moves in the main-scanning direction from the predetermined position on the left side of the print paper P to the predetermined position on the right side, thesystem controller 54 determines that the upper right end of the print paper P is leading the upper left end in the sub-scanning direction by a distance h2 (> distance h), as regards the carrying status of the print paper P. That is, it determines that there is an effect on borderless printing. At this time, the main-scan drive circuit 61 drives theCR motor 30 so that theprint head 36 returns to the predetermined position on the left side of the print paper P. In this way, theprint head 36 is moved up to the predetermined position on the left side from the above-mentioned intermediate point for when theprint head 36 was being moved in the main-scanning direction from the predetermined position on the left side of the print paper P to the predetermined position on the right side, and the print head is then stopped. It should be noted that theprint head 36 may instead ascertain the right side edge of the print paper P without moving from the above-mentioned intermediate point to the predetermined position on the left side. - The
system controller 54 supplies a control signal for driving theCR motor 30 to the main-scan drive circuit 61. Also, thesystem controller 54 supplies to the reflective optical sensor control circuit 65 a control signal for the electricsignal measuring section 66 to detect light irradiated to the print paper P at the normal measuring accuracy. In this way, theprint head 36 begins to move in the main-scanning direction from the predetermined position of the left side of the print paper P toward a predetermined position of the right side in conjunction with movement of the carriage 28 (see Fig. 14(f)). At the same time, the electricsignal measuring section 66 begins measuring the intensity of the electric signal obtained from the light-receivingmember 40 at the normal measuring accuracy. Then, the result of the measurement by the electricsignal measuring section 66 is supplied to the system controller 54 (S102). - When the measurement result obtained from the electric
signal measuring section 66 is the logic value "L" (S104: NO), thesystem controller 54 determines that light is irradiated onto the print paper P. Moreover, when thesystem controller 54 determines that theprint head 36 has not moved to the predetermined position on the right side of the print paper P (S106: NO), then the operations of step S102 and step S104 are executed again. That is, when thesystem controller 54 determines that the result of the measurement by the electricsignal measuring section 66 has changed from the logic value "L" to the logic value "H," then it is determined that theprint head 36 is positioned at the right side edge of the print paper P on the assumption that movement of thecarriage 28 has led to a change from the state where light is irradiated onto the print paper P to a state where light is irradiated onto the platen 26 (see Fig. 15). - When the measurement result obtained from the electric
signal measuring section 66 is the logic value "H" (S104: YES), or when thesystem controller 54 determines that theprint head 36 has moved to the predetermined position on the right side of the print paper P (S106: YES), then the main-scan drive circuit 61 stops driving theCR motor 30. In this way, theprint head 36 stops at the position of the positive branch of step S104 or step S106 (S108). - The main-
scan drive circuit 61 drives theCR motor 30 so that theprint head 36 moves in the main-scanning direction to the left from the stop position of the positive branch of step S104 or step S106 by a distance of u1. It should be noted that the distance u1 is longer than a distance u2 in the main-scanning direction between the upper right end of the print paper P and the reflectiveoptical sensor 29 for when the upper right end, in the sub-scanning direction, of the print paper P leads the upper left end by a maximum limit. In this way, theprint head 36 moves up to the position where the reflectiveoptical sensor 29 is more to the left, in the main-scanning direction, than the upper right end of the print paper P and stops (see Fig. 14(g) and Fig. 15). That is, it becomes possible to later detect the upper edge of the print paper P (S110). - Since the
system controller 54 determines that the reflectiveoptical sensor 29 is irradiating light onto the print paper P, thesystem controller 54 supplies a control signal for driving thePF motor 31 to thesub-scan drive circuit 62. Thesub-scan drive circuit 62 drives thePF motor 31 so that the print paper P is carried in the direction opposite from the sub-scanning direction in units of a predetermined amount. It should be noted that the predetermined amount at this time is an integer multiple n (n is an integer of 1 or greater) of the smallest dot pitch in the sub-scanning direction. For example, when the resolution is 1440 dpi, then the predetermined amount is n/1440 inch. In this way, the print paper P is carried by the predetermined amount in the direction opposite from the sub-scanning direction (S112). - Based on the fact that print paper P was carried in the direction opposite from the sub-scanning direction by the predetermined amount (for instance, n/1440 inch), the
system controller 54 writes "0-n/1440" = "-n/1440" to theRAM 57 as the position information BF of the upper edge of the print paper P. That is, theoretically, the print paper P is successively carried in the direction opposite from the sub-scanning direction from the stop position of step S110 in units of n/1440 inch (S114). - When the print paper P is carried in the direction opposite from the sub-scanning direction in steps S112 and S114, the electric
signal measuring section 66 of the reflective opticalsensor control circuit 65 measures the intensity of the electric signal obtained from the light-receivingmember 40 for when theprint head 36 is stopped at the stop position of step S110 (S116). If the measurement result obtained by the electricsignal measuring section 66 at this time is the logic value "L" (S116: NO), then thesystem controller 54 determines whether or not the position information BF of the upper edge of the print paper P in theRAM 57 has reached "-m/1440" (S118). - If the position information BF of the upper edge of the print paper P in the
RAM 57 has not reached "-m/1440" (m>n) (S118: NO), then the procedure is once again executed from step S112, but if the position information BF of the upper edge of the print paper P in theRAM 57 has reached "-m/1440" (S118: YES), then thesystem controller 54 determines that the print paper P has become, for example, jammed because of failure in the mechanism for carrying the print paper P, due to the fact that the light is still being irradiated on the print paper P even though the print paper P should have been carried in the direction opposite from the sub-scanning direction by m/1440 inches from the stop position of step S110. Thus, the reflective opticalsensor control circuit 65 sets the reflectiveoptical sensor 29 to a stopped state in which light is not emitted or received (S120). Moreover, thesystem controller 54 supplies an error signal for alerting the user that the carrying mechanism for the print paper P has failed to, for example, the display devices and speakers, which are not shown, of thecolor inkjet printer 20, thereby ending a series of processes (S122). - In step S116, the
system controller 54 determines that the reflectiveoptical sensor 29 emits light onto theplaten 26 when the measurement result obtained from the electricsignal measuring section 66 is the logic value "H" (S116: YES) (see Fig. 14(h)). - Then, the
system controller 54 supplies a control signal for step-driving thePF motor 31 to thesub-scan drive circuit 62. Thesub-scan drive circuit 62 drives thePF motor 31 so that the print paper P is carried in the sub-scanning direction in units of a predetermined amount. It should be noted that the predetermined amount at this time is the smallest dot pitch in the sub-scanning direction. For example, when the resolution is 1440 dpi, the predetermined amount is 1/1440 inch (approx. 17.65 µm). Thus, the print paper P is carried in the sub-scanning direction by the predetermined amount (S124). - Based on the fact that the print paper P was carried in the sub-scanning direction by the predetermined amount (for instance, 1/1440 inch), the
system controller 54 writes "0+1/1440" = "1/1440" to theRAM 57 as the position information PF of the upper edge of the print paper P. That is, theoretically, the print paper P is successively carried in the sub-scanning direction from the stop position of the positive branch of step S116 in units of 1/1440 inch (S126). - The electric
signal measuring section 66 of the reflective opticalsensor control circuit 65 again measures the intensity of the electric signal obtained from the light-receivingmember 40 for when theprint head 36 is stopped at the predetermined position of step S110. The measurement result obtained by the electricsignal measuring section 66 is supplied to thesystem controller 54. (S128) - When the measurement result obtained from the electric
signal measuring section 66 at this time is the logic value "H" (S128: NO), then thesystem controller 54 determines whether or not the position information PF of the upper edge of the print paper P in theRAM 57 has reached "s/1440" (s>1) on the assumption that light is not emitted onto the print paper P (S130). - When the position information PF of the upper edge of the print paper P in the
RAM 57 has not reached "s/1440" (S130: NO), then the procedure is executed again from step S124, and when the position information PF of the upper edge of the print paper P in theRAM 57 has reached "s/1440" (S130: YES), then thesystem controller 54 determines either that the amount of light emitted from the light-emittingmember 38 is no longer an appropriate amount, or that a failure of the mechanism for carrying the print paper P has occurred and the print paper P can no longer be carried in the sub-scanning direction, due to the fact that the light is being emitted on theplaten 26 even though the print paper P should have been carried in the sub-scanning direction by s/1440 inches from the stop position of the positive branch of step S116. Thus, the reflective opticalsensor control circuit 65 sets the reflectiveoptical sensor 29 to a stopped state in which it does not emit or receive light (S132). Moreover, thesystem controller 54 supplies an error signal for alerting the user that either the amount of light emitted by the light-emittingmember 38 is not an appropriate amount, or that the carrying mechanism for the print paper P has failed to, for example, the display devices and speakers, which are not shown, of thecolor inkjet printer 20, thereby ending a series of processes (S134). - When the measurement result obtained by the electric
signal measuring section 66 is the logic value "L" in step S128 (S128: YES), thesystem controller 54 determines that light is being irradiated onto the upper right end, in the sub-scanning direction, of the print paper P (see Fig. 14(i)). - The
system controller 54 supplies a control signal for driving theCR motor 30 to the main-scan drive circuit 61. Thus, theprint head 36 moves in the main-scanning direction from the stopped position of step S110 up to a predetermined position of the left side of the print paper P, then moves from the predetermined position of the left side on the print paper P to the predetermined position on the right side, and then stops (see Figs. 14(i) and (k)). That is, the print start position of theprint head 36 in the main-scanning direction is determined (S136, S138). It should be noted that theprint head 36 does not have to return to the predetermined position on the right side. - The main-
scan drive circuit 61 stops driving the CR motor 30 (S140). Also, the reflective opticalsensor control circuit 65 sets the reflectiveoptical sensor 29 to a stopped state in which it does not emit or receive light (S142). - The
system controller 54 supplies a control signal for driving thePF motor 31 to thesub-scan drive circuit 62. Thesub-scan drive circuit 62 drives thePF motor 31 so that the upper right end of the print paper P is at the foremost position of the print head 36 (position of theblack nozzle # 1 and the yellow nozzle #1). In this way, the print paper P is carried in the sub-scanning direction by a distance x (= 179 kD), which is a distance from #1 to #180 of the black nozzle row K of theprint head 36, and the upper right end of the print paper P is positioned on the same line as the foremost position of theprint head 36 in the main-scanning direction. That is, the print start position of the print paper P in the sub-scanning direction is determined (see Fig. 14(1)). Then, borderless printing of the predetermined image specified by the user is performed. It should be noted that it is also possible to shorten the distance x and eject ink starting from the upper side of the upper left end of the print paper P so as to reliably perform borderless printing (S144). It should be noted that the carrying distance of the print paper P in Fig. 14(1) is not limited to x. For example, depending on the various printing modes, the print paper P may be carried so that the upper right end of the print paper P is positioned at any position on #1 to #180 of the black nozzle row. - Incidentally, if either the upper right end or the upper left end of the print paper P is carried leading the other in a printing apparatus for carrying print paper P in a sub-scanning direction that intersects the main-scanning direction of the
print head 36, then the actual print start position on the print paper P deviates from the anticipated print start position, and this is not preferable. In particular, in the case of performing borderless printing, then there is a possibility that the print paper P may be rendered useless when blank areas are left on the upper edge of the print paper P due to the skew in the carrying direction of the print paper P. On the other hand, when performing borderless printing, an increase in the margin of the print range in order to cover the entire print paper P reduces the possibility that a blank area will be formed at the upper edge of the print paper P; however, there is a possibility that the amount of ink consumed will increase. - In view of the above, the apparatus is configured such that, when an upper end, of among the upper right end or the upper left end of the print paper P, that is on the side where the reflective
optical sensor 29 is positioned is leading the other at the detection position, the print paper P is carried from that detection position in the predetermined direction by a predetermined amount. On the other hand, only when an upper end, of among the upper right end or the upper left end of the print paper P, that is on the side opposite from the side where the reflectiveoptical sensor 29 is positioned is leading the other by at least a set amount at the detection position, then the reflectiveoptical sensor 29 is positioned from the one side to the other side, the print paper P is carried from the detection position in the direction opposite from the predetermined direction, then the print paper P is carried in the predetermined direction up to the detection position where the electricsignal measuring section 66 detects the print paper P, and then the print paper P is carried in the predetermined direction from the detection position by a predetermined amount. By doing this, the print start position, in the predetermined direction, of the print paper P can be determined very accurately and efficiently, and formation of blank areas at the upper edge of the print paper P and an increase in the ink-consumption amount upon borderless printing are eliminated. - Further, when the upper end, among the upper right end and the upper left end of the print paper P, that is on the side opposite from the side where the reflective
optical sensor 29 is positioned is leading the other by less than the set amount at the detection position, the print paper P may be carried in the predetermined direction from the detection position by the predetermined amount. - In this way, the print paper P is carried as it is from the detection position in the predetermined direction by the predetermined amount in a case where the upper end, among the upper right end and the upper left end of the print paper P, that is on the side opposite from the side where the reflective
optical sensor 29 is positioned is leading the other only by an amount that is less than the set amount at the detection position. Thus, the print start position, in the predetermined direction, of the print paper P can be determined very accurately and efficiently. - Further, this apparatus may be provided with a
print head 36 for printing on the print paper P by ejecting ink as the print head moves in a main-scanning direction that intersects the carrying direction in which the print paper P is carried. - In this way, the print start position, in the predetermined direction, of the
print paper 36 can be determined very accurately and efficiently in cases where there is aprint head 36 that can move in a main-scanning direction that intersects the carrying direction in which the print paper P is carried. - Further, the reflective
optical sensor 29 may be provided together with theprint head 36 in/on acarriage 28 for moving in the main-scanning direction. - In this way, the print start position, in the predetermined direction, of the print paper P can be determined very accurately and efficiently using the reflective
optical sensor 29 that is provided together with theprint head 36 in/on thecarriage 28. - Further, the upper end, among the upper right end and the upper left end of the print paper P, that is leading the other at the detection position may be found by detecting whether or not the print paper P is present by moving the reflective
optical sensor 29 from the one side to the other side in the movement direction after carrying the print paper P in the predetermined direction up to the detection position where the reflectiveoptical sensor 29 positioned on the one side in the movement direction detects the print paper P. - In this way, it is possible to determine the print start position, in a predetermined direction, of the print paper P very accurately and efficiently using the reflective
optical sensor 29 for detecting whether or not the print paper P is present by moving from one side to the other side in a movement direction after the print paper P is carried in the predetermined direction up to the detection position where the reflectiveoptical sensor 29 positioned on the one side in the movement direction detects the print paper P. - Further, it may be made difficult for the reflective
optical sensor 29 to detect the print paper P when the reflectiveoptical sensor 29 is moved from the one side to the other side in the movement direction. - In this way, by making it difficult for the reflective
optical sensor 29 to detect the print paper P, the print paper P is kept from being carried in the direction opposite from the predetermined direction if the upper end, among the upper right end and the upper left end of the print paper P, that is on the side opposite from the side where the reflectiveoptical sensor 29 is positioned is leading by less than a set amount. Thus, it is possible to determine the print start position, in the predetermined direction, of the print paper P more efficiently. - Further, in the process of moving the reflective
optical sensor 29 from the one side to the other side in the movement direction, if the reflectiveoptical sensor 29 does not detect the print paper P, then it is assumed that the upper end, among the upper right end and the upper left end of the print paper P, that is on the one side in the movement direction of the reflectiveoptical sensor 29 is leading the other at the detection position, or that the upper end, among the upper right end and the upper left end of the print paper P, that is on the other side in the movement direction of the reflectiveoptical sensor 29 is leading the other by less than the set amount; and if the reflectiveoptical sensor 29 detects the print paper P, then it is assumed that the upper end, among the upper right end and the upper left end of the print paper P, that is on the other side in the movement direction of the reflectiveoptical sensor 29 is leading by at least the set amount. - In this way, when the reflective
optical sensor 29 does not detect the print paper P, then it is assumed that the upper end, among the upper right end and the upper left end of the print paper P, that is on the one side in the movement direction of the reflectiveoptical sensor 29 is leading the other at the detection position, or that the upper end, among the upper right end and the upper left end of the print paper P, that is on the other side in the movement direction of the reflectiveoptical sensor 29 is leading the other only by an amount that is less than the set amount. Thus, the print paper P is kept from being carried in the direction opposite from the predetermined direction, allowing the print start position, in the predetermined direction, of the print paper P to be determined more efficiently. - Further, the reflective
optical sensor 29 may have a light-emittingmember 38 for emitting light and a light-receivingmember 40 for receiving the light that is emitted by the light-emittingmember 38, and may detect the print paper P based on an output value of the light-receivingmember 40. - In this way, the print start position, in the predetermined direction, of the print paper P can be determined very accurately and efficiently using the reflective
optical sensor 29, which includes a light-emittingmember 38 and a light-receivingmember 40. - Further, the
print head 36 may perform printing with respect to an entire surface of the print paper P. - In this way, it is possible to determine the print start position, in the predetermined direction, of the medium to be printed very accurately and efficiently in cases where printing is carried out with respect to the entire surface of the medium to be printed.
- A print apparatus, a printing method, a program, and a computer system according to the present invention were described above according to an embodiment thereof. However, the foregoing embodiment of the invention is for the purpose of elucidating the present invention and is not to be interpreted as limiting the present invention. The invention can of course be altered and improved without departing from the gist thereof and includes equivalents.
- In the initial state of the
color inkjet printer 20, it is also possible to position the reflectiveoptical sensor 29 on the one side in the movement direction. This allows the operation for determining the print start position, in the sub-scanning direction, of the print paper P to be simplified. It is also possible to carry the print paper P in the sub-scanning direction while moving the reflectiveoptical sensor 29 in the main-scanning direction, so as to detect the upper edge of the print paper P. - In the foregoing embodiment, the print paper P was adopted as the medium to be printed, but this is not a limitation. That is, in the present invention, it is also possible to adopt film, cloth, or thin metal plates, for example, as the medium to be printed.
- It is also possible to provide the
color inkjet printer 20 with some of the functions or mechanisms of a main computer unit, a display device, an input device, a flexible disk drive device, and a CD-ROM drive device. For example, it is possible to adopt a configuration in which thecolor inkjet printer 20 is provided with an image processing section for carrying out image processing, a display section for carrying out various types of displays, and a recording media attachment/detachment section to and from which recording media storing image data captured by a digital camera or the like are inserted and taken out. - In the foregoing embodiment, a
color inkjet printer 20 was adopted, but this is not a limitation. That is, the present invention can be adopted for monochrome inkjet printers and non-inkjet type printers, for example, as well. Moreover, the present invention can be adopted for printing apparatuses such as facsimile devices and copy machines. - In the foregoing embodiment, the light-emitting
member 38 and the light-receivingmember 40 were both provided in thecarriage 28 along with theprint head 36, but this is not a limitation. That is, it is also possible to adopt a configuration in which the light-emittingmember 38 and the light-receivingmember 40 are separate of thecarriage 28 and can move in synchronization with one other in the main-scanning direction. Also, the light-emittingmember 38 and the light-receivingmember 40 are not limited to a reflective optical sensor, and may also be a transmission-type optical sensor in which the medium to be printed is in the light path, a line sensor, or an area sensor, for example. - According to the present invention, the print start position, in a predetermined direction, of a medium to be printed can be determined with high precision and efficiency.
Claims (15)
- A printing apparatus comprising:detection means that is capable of moving and that is for detecting a medium to be printed; andcarrying means for carrying the medium to be printed in a direction that intersects a movement direction of said detection means;said printing apparatuscausing said detection means to be positioned on one side in said movement direction;causing said carrying means to carry said medium to be printed in a predetermined direction up to a detection position where said detection means detects said medium to be printed; andwhen an upper end, among an upper right end and an upper left end of said medium to be printed, that is on a side opposite from a side where said detection means is positioned is leading by at least a set amount at said detection position, causing said detection means to be positioned on the other side that is opposite from the one side in said movement direction, then causing said carrying means to carry said medium to be printed from said detection position in a direction opposite from said predetermined direction, then causing said medium to be printed to be carried in said predetermined direction up to the detection position where said detection means detects said medium to be printed, and then causing said medium to be printed to be carried by a predetermined amount in said predetermined direction from said detection position.
- A printing apparatus according to claim 1,
wherein when an upper end, among the upper right end and the upper left end of said medium to be printed, that is on the side where said detection means is positioned is leading at said detection position, said medium to be printed is carried by said carrying means in said predetermined direction from said detection position by said predetermined amount. - A printing apparatus according to claim 2,
wherein when the upper end, among the upper right end and the upper left end of said medium to be printed, that is on the side opposite from the side where said detection means is positioned is leading by less than said set amount at said detection position, said medium to be printed is carried by said carrying means in said predetermined direction from said detection position by said predetermined amount. - A printing apparatus according to claim 1, comprising:a print head for printing on said medium to be printed by ejecting ink as said print head moves in a main-scanning direction that intersects the carrying direction in which said medium to be printed is carried.
- A printing apparatus according to claim 4,
wherein said detection means is provided together with said print head in/on a moving member for moving in said main-scanning direction. - A printing apparatus according to claim 1,
wherein the upper end, among the upper right end and the upper left end of said medium to be printed, that is leading at said detection position is found by detecting whether or not said medium to be printed is present by moving said detection means from the one side to the other side in said movement direction after carrying said medium to be printed in said predetermined direction up to said detection position where said detection means positioned on the one side in said movement direction detects said medium to be printed. - A printing apparatus according to claim 6,
wherein it is made difficult for said detection means to detect said medium to be printed when said detection means is moved from the one side to the other side in said movement direction. - A printing apparatus according to claim 7,
wherein, in the process of moving said detection means from the one side to the other side in said movement direction,if said detection means does not detect said medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of said medium to be printed, that is on said one side in said movement direction of said detection means is leading at said detection position, or that the upper end, among the upper right end and the upper left end of said medium to be printed, that is on said other side in said movement direction of said detection means is leading by less than the set amount, andif said detection means detects said medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of said medium to be printed, that is on said other side in said movement direction of said detection means is leading by at least the set amount. - A printing apparatus according to claim 1,
wherein said detection means has a light-emitting member for emitting light and a light-receiving member for receiving the light that is emitted by said light-emitting member, and detects said medium to be printed based on an output value of said light-receiving member. - A printing apparatus according to claim 3,
wherein said print head performs printing with respect to an entire surface of said medium to be printed. - A printing apparatus comprising:detection means that is capable of moving and that is for detecting a medium to be printed; andcarrying means for carrying the medium to be printed in a direction that intersects a movement direction of said detection means;said printing apparatuscausing said detection means to be positioned on one side in said movement direction;causing said carrying means to carry said medium to be printed in a predetermined direction up to a detection position where said detection means detects said medium to be printed;when an upper end, among an upper right end and an upper left end of said medium to be printed, that is on a side where said detection means is positioned is leading at said detection position, causing said medium to be printed to be carried by said carrying means in said predetermined direction from said detection position by a predetermined amount;when an upper end, among the upper right end and the upper left end of said medium to be printed, that is on a side opposite from the side where said detection means is positioned is leading by at least a set amount at said detection position, causing said detection means to be positioned on the other side that is opposite from the one side in said movement direction, then causing said carrying means to carry said medium to be printed from said detection position in a direction opposite from said predetermined direction, then causing said medium to be printed to be carried in said predetermined direction up to the detection position where said detection means detects said medium to be printed, and then causing said medium to be printed to be carried by said predetermined amount in said predetermined direction from said detection position;when the upper end, among the upper right end and the upper left end of said medium to be printed, that is on the side opposite from the side where said detection means is positioned is leading by less than said set amount at said detection position, causing said medium to be printed to be carried by said carrying means in said predetermined direction from said detection position by said predetermined amount;printing on said medium to be printed by causing a print head to eject ink as said print head moves in a main-scanning direction that intersects the carrying direction in which said medium to be printed is carried;being provided with said detection means and said print head both in/on a moving member for moving in said main-scanning direction;finding the upper end, among the upper right end and the upper left end of said medium to be printed, that is leading at said detection position by detecting whether or not said medium to be printed is present by moving said detection means from the one side to the other side in said movement direction after carrying said medium to be printed in said predetermined direction up to said detection position where said detection means positioned on the one side in said movement direction detects said medium to be printed;when said detection means is moved from the one side to the other side in said movement direction, making it difficult for said detection means to detect said medium to be printed so thatif said detection means does not detect said medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of said medium to be printed, that is on said one side in said movement direction of said detection means is leading at said detection position, or that the upper end, among the upper right end and the upper left end of said medium to be printed, that is on said other side in said movement direction of said detection means is leading by less than the set amount, andif said detection means detects said medium to be printed, then it is assumed that the upper end, among the upper right end and the upper left end of said medium to be printed, that is on said other side in said movement direction of said detection means is leading by at least the set amount; andperforming printing with respect to an entire surface of said medium to be printed.
- A printing method for a printing apparatus provided with a sensor that is capable of moving and that is for detecting a medium to be printed, and a carry roller for carrying the medium to be printed in a direction that intersects a movement direction of said sensor, said printing method comprising:a step of causing said sensor to be positioned on one side in said movement direction;a step of causing said carry roller to carry said medium to be printed in a predetermined direction up to a detection position where said sensor detects said medium to be printed; anda step of, when an upper end, among an upper right end and an upper left end of said medium to be printed, that is on a side opposite from a side where said sensor is positioned is leading by at least a set amount at said detection position, causing said sensor to be positioned on the other side that is opposite from the one side in said movement direction, then causing said carry roller to carry said medium to be printed from said detection position in a direction opposite from said predetermined direction, then causing said medium to be printed to be carried in said predetermined direction up to the detection position where said sensor detects said medium to be printed, and then causing said medium to be printed to be carried by a predetermined amount in said predetermined direction from said detection position.
- A program for causing a printing apparatus provided with detection means that is capable of moving and that is for detecting a medium to be printed, and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of said detection means, to achieve:a function of causing said detection means to be positioned on one side in said movement direction;a function of causing said carrying means to carry said medium to be printed in a predetermined direction up to a detection position where said detection means detects said medium to be printed; anda function of, when an upper end, among an upper right end and an upper left end of said medium to be printed, that is on a side opposite from a side where said detection means is positioned is leading by at least a set amount at said detection position, causing said detection means to be positioned on the other side that is opposite from the one side in said movement direction, then causing said carrying means to carry said medium to be printed from said detection position in a direction opposite from said predetermined direction, then causing said medium to be printed to be carried in said predetermined direction up to the detection position where said detection means detects said medium to be printed, and then causing said medium to be printed to be carried by a predetermined amount in said predetermined direction from said detection position.
- A computer system comprising:a printing apparatus provided with detection means that is capable of moving and that is for detecting a medium to be printed, and carrying means for carrying the medium to be printed in a direction that intersects a movement direction of said detection means; anda main computer unit that is connected to said printing apparatus;said computer systemcausing said detection means to be positioned on one side in said movement direction;causing said carrying means to carry said medium to be printed in a predetermined direction up to a detection position where said detection means detects said medium to be printed; andwhen an upper end, among an upper right end and an upper left end of said medium to be printed, that is on a side opposite from a side where said detection means is positioned is leading by at least a set amount at said detection position, causing said detection means to be positioned on the other side that is opposite from the one side in said movement direction, then causing said carrying means to carry said medium to be printed from said detection position in a direction opposite from said predetermined direction, then causing said medium to be printed to be carried in said predetermined direction up to the detection position where said detection means detects said medium to be printed, and then causing said medium to be printed to be carried by a predetermined amount in said predetermined direction from said detection position.
- A printing apparatus comprising:a sensor that is capable of moving and that is for detecting a medium to be printed; anda carry roller for carrying the medium to be printed in a direction that intersects a movement direction of said sensor;said printing apparatuscausing said sensor to be positioned on one side in said movement direction;causing said carry roller to carry said medium to be printed in a predetermined direction up to a detection position where said sensor detects said medium to be printed; andwhen an upper end, among an upper right end and an upper left end of said medium to be printed, that is on a side opposite from a side where said sensor is positioned is leading by at least a set amount at said detection position, causing said sensor to be positioned on the other side that is opposite from the one side in said movement direction, then causing said carry roller to carry said medium to be printed from said detection position in a direction opposite from said predetermined direction, then causing said medium to be printed to be carried in said predetermined direction up to the detection position where said sensor detects said medium to be printed, and then causing said medium to be printed to be carried by a predetermined amount in said predetermined direction from said detection position.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002196237 | 2002-07-04 | ||
JP2002196237 | 2002-07-04 | ||
PCT/JP2003/008371 WO2004005035A1 (en) | 2002-07-04 | 2003-07-01 | Printer, printing method, program, computer system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1524123A1 true EP1524123A1 (en) | 2005-04-20 |
EP1524123A4 EP1524123A4 (en) | 2007-03-14 |
Family
ID=30112363
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03741146A Withdrawn EP1524123A4 (en) | 2002-07-04 | 2003-07-01 | Printer, printing method, program, computer system |
Country Status (5)
Country | Link |
---|---|
US (1) | US7549813B2 (en) |
EP (1) | EP1524123A4 (en) |
JP (2) | JP4770172B2 (en) |
CN (1) | CN1330502C (en) |
WO (1) | WO2004005035A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE424305T1 (en) * | 2002-08-08 | 2009-03-15 | Seiko Epson Corp | RECORDING DEVICE, RECORDING METHOD, PROGRAM, COMPUTER SYSTEM |
JP3835383B2 (en) | 2002-09-09 | 2006-10-18 | セイコーエプソン株式会社 | Liquid ejection apparatus and computer system |
US7525674B2 (en) * | 2005-04-12 | 2009-04-28 | Seiko Epson Corporation | Print control data generating apparatus, print system, printer, and print control data generating method |
JP4513774B2 (en) * | 2006-03-15 | 2010-07-28 | セイコーエプソン株式会社 | Recording apparatus and recording method |
CN113968079B (en) * | 2021-10-21 | 2023-03-24 | 珠海奔彩电子股份有限公司 | Printing method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0556045A2 (en) * | 1992-02-12 | 1993-08-18 | Canon Kabushiki Kaisha | Image recording apparatus with improved conveying system for recording medium |
EP1195248A1 (en) * | 1999-07-02 | 2002-04-10 | Copyer Co., Ltd. | Ink-jet recorder |
EP1213150A1 (en) * | 1999-08-31 | 2002-06-12 | Copyer Co., Ltd. | Medium detecting method and device, and printer |
EP1449670A1 (en) * | 2002-02-21 | 2004-08-25 | Seiko Epson Corporation | Printer, method for determining top edge of object to be printed, method for determining bottom edge of object to be printed, computer program, and computer system |
EP1449662A1 (en) * | 2002-02-21 | 2004-08-25 | Seiko Epson Corporation | Printing apparatus, printing method, computer program, and computer system |
Family Cites Families (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60257279A (en) * | 1984-06-04 | 1985-12-19 | Fuji Xerox Co Ltd | Paper detector for printer |
JPH02255360A (en) * | 1989-03-30 | 1990-10-16 | Brother Ind Ltd | Printing position corrector of printer |
JPH02255369A (en) * | 1989-03-30 | 1990-10-16 | Nec Off Syst Ltd | Color printer |
JP3149174B2 (en) * | 1990-05-17 | 2001-03-26 | セイコーエプソン株式会社 | Printer |
JPH0422667A (en) * | 1990-05-18 | 1992-01-27 | Seiko Epson Corp | Printer fitted with paper width detector |
JPH0422668A (en) * | 1990-05-18 | 1992-01-27 | Seiko Epson Corp | Printer fitted with paper width detector |
JPH0439074A (en) * | 1990-06-04 | 1992-02-10 | Seiko Epson Corp | Paper feeder |
JPH054395A (en) * | 1991-06-26 | 1993-01-14 | Oki Electric Ind Co Ltd | Control method of pulse motor in medium conveyor |
JPH06293163A (en) * | 1993-04-08 | 1994-10-21 | Tokyo Electric Co Ltd | Printer |
US5397192A (en) * | 1993-11-01 | 1995-03-14 | Hewlett-Packard Company | Shuttle-type printers and methods for operating same |
JPH08132697A (en) * | 1994-11-02 | 1996-05-28 | Hitachi Ltd | Document forming apparatus |
US5466079A (en) * | 1995-01-27 | 1995-11-14 | Hewlett-Packard Company | Apparatus for detecting media leading edge and method for substantially eliminating pick skew in a media handling subsystem |
JPH091880A (en) * | 1995-06-19 | 1997-01-07 | Copyer Co Ltd | Image forming unit |
JPH0924653A (en) * | 1995-07-13 | 1997-01-28 | Nec Niigata Ltd | Printing device having function of correcting printing position |
JPH10291689A (en) | 1997-04-16 | 1998-11-04 | Seiko Epson Corp | Printer |
JPH1148556A (en) * | 1997-08-07 | 1999-02-23 | Mitsubishi Electric Corp | Paper position detecting mechanism for printer |
JPH11184590A (en) * | 1997-10-13 | 1999-07-09 | Fuji Xerox Co Ltd | State displaying method and device |
JP3930120B2 (en) * | 1997-10-17 | 2007-06-13 | 富士通株式会社 | Printing apparatus and recording medium |
JPH11170639A (en) * | 1997-12-05 | 1999-06-29 | Alps Electric Co Ltd | Method for detecting diagonal advancing in printer, and printer |
JPH11170640A (en) * | 1997-12-15 | 1999-06-29 | Alps Electric Co Ltd | Method for transferring recording medium in printer, and printer |
JPH11193152A (en) * | 1997-12-26 | 1999-07-21 | Copyer Co Ltd | Image forming device |
JP2000191183A (en) * | 1998-12-28 | 2000-07-11 | Nec Home Electronics Ltd | Printer |
JP2001001617A (en) * | 1999-06-23 | 2001-01-09 | Copyer Co Ltd | Image-recording apparatus |
JP2003112416A (en) * | 2001-10-03 | 2003-04-15 | Seiko Epson Corp | Method of recording and recorder |
JP3863064B2 (en) * | 2002-05-28 | 2006-12-27 | セイコープレシジョン株式会社 | Printer |
JP2004009529A (en) * | 2002-06-06 | 2004-01-15 | Canon Inc | Apparatus for recording and method for recording |
US6997455B2 (en) * | 2004-02-09 | 2006-02-14 | Eastman Kodak Company | Sheet deskewing method and apparatus |
JP4513774B2 (en) * | 2006-03-15 | 2010-07-28 | セイコーエプソン株式会社 | Recording apparatus and recording method |
-
2003
- 2003-07-01 CN CNB038195763A patent/CN1330502C/en not_active Expired - Fee Related
- 2003-07-01 JP JP2004519226A patent/JP4770172B2/en not_active Expired - Fee Related
- 2003-07-01 WO PCT/JP2003/008371 patent/WO2004005035A1/en not_active Application Discontinuation
- 2003-07-01 US US10/520,118 patent/US7549813B2/en not_active Expired - Fee Related
- 2003-07-01 EP EP03741146A patent/EP1524123A4/en not_active Withdrawn
-
2009
- 2009-06-08 JP JP2009136821A patent/JP5115521B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0556045A2 (en) * | 1992-02-12 | 1993-08-18 | Canon Kabushiki Kaisha | Image recording apparatus with improved conveying system for recording medium |
EP1195248A1 (en) * | 1999-07-02 | 2002-04-10 | Copyer Co., Ltd. | Ink-jet recorder |
EP1213150A1 (en) * | 1999-08-31 | 2002-06-12 | Copyer Co., Ltd. | Medium detecting method and device, and printer |
EP1449670A1 (en) * | 2002-02-21 | 2004-08-25 | Seiko Epson Corporation | Printer, method for determining top edge of object to be printed, method for determining bottom edge of object to be printed, computer program, and computer system |
EP1449662A1 (en) * | 2002-02-21 | 2004-08-25 | Seiko Epson Corporation | Printing apparatus, printing method, computer program, and computer system |
Non-Patent Citations (1)
Title |
---|
See also references of WO2004005035A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1675069A (en) | 2005-09-28 |
US20060169161A1 (en) | 2006-08-03 |
JP5115521B2 (en) | 2013-01-09 |
JP4770172B2 (en) | 2011-09-14 |
US7549813B2 (en) | 2009-06-23 |
JP2009234267A (en) | 2009-10-15 |
EP1524123A4 (en) | 2007-03-14 |
JPWO2004005035A1 (en) | 2005-11-04 |
CN1330502C (en) | 2007-08-08 |
WO2004005035A1 (en) | 2004-01-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7530686B2 (en) | Recording method, recording apparatus, and computer-readable storage medium for performing borderless recording on skewed media | |
EP1535747B1 (en) | Recording apparatus, recording method, program, computer system | |
WO2004091917A1 (en) | Device, system, and method for discharging liquid | |
JP5115521B2 (en) | Printing apparatus and printing method | |
US7537302B2 (en) | Liquid ejecting apparatus, computer system, and liquid ejecting method | |
US6984082B2 (en) | Printer, method for determining top edge of object to be printed, method for determining bottom edge of object to be printed, computer program, and computer system | |
US7618114B2 (en) | Liquid ejection method and liquid ejecting apparatus | |
JP2011102197A (en) | Printing device, printed body lower end determining method, computer program, and computer system | |
JP4803129B2 (en) | Printing apparatus and printing method | |
JP4542303B2 (en) | Liquid ejection device and computer system | |
JP4019730B2 (en) | Printing apparatus, printing medium lower end determination method, computer program, and computer system | |
JP3972953B2 (en) | Liquid ejection device | |
JP5018987B2 (en) | Liquid ejection device and computer system | |
JP3838171B2 (en) | Liquid ejection device and computer system | |
JP4192928B2 (en) | Tilt detection method and printing method | |
JP2003246105A (en) | Printer, method for determining upper end of print object, computer program, and computer system | |
JP2004050680A (en) | Liquid discharging device and computer system | |
JP2011218817A (en) | Liquid discharge device, and computer system | |
JP2010137579A (en) | Liquid ejecting apparatus | |
JP2006297946A (en) | Liquid discharge device and computer system | |
JP2004034612A (en) | Liquid discharging apparatus and computer system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20050110 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: B41J 11/00 20060101AFI20070201BHEP |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20070207 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20080201 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: B41J 11/00 20060101AFI20140923BHEP |